Jewish sources present competing views on whether Abraham, Isaac, and Jacob were bound by and observed all the commandments of the Torah before it was given at Sinai. Classical rabbinic sources cite Genesis 26:5 as evidence that the patriarchs kept the full Torah, while medieval commentaries grapple with textual difficulties—particularly Jacob's marriage to two sisters—and propose nuanced resolutions ranging from geographic limitation to voluntary spiritual observance.
קִיֵּים אַבְרָהָם אָבִינוּ כָּל הַתּוֹרָה כּוּלָּהּ
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Genesis 26:5
God tells Isaac that Abraham obeyed His voice and kept His charge, commandments, statutes, and laws — the classic prooftext for the tradition that Abraham observed the entire Torah before it was given.
עֵ֕קֶב אֲשֶׁר־שָׁמַ֥ע אַבְרָהָ֖ם בְּקֹלִ֑י וַיִּשְׁמֹר֙ מִשְׁמַרְתִּ֔י מִצְוֺתַ֖י חֻקּוֹתַ֥י וְתוֹרֹתָֽי׃
inasmuch as Abraham obeyed Me and kept My charge: My commandments, My laws, and My teachings.”
Yoma 28b:9
The Talmud states that Abraham observed the entire Torah, including rabbinic enactments such as eruv tavshilin, deriving this from the phrase 'my Torah' in Genesis 26:5. This is a central Talmudic locus for the claim that the patriarchs kept all of the Torah.
אָמַר רַב: קִיֵּים אַבְרָהָם אָבִינוּ כָּל הַתּוֹרָה כּוּלָּהּ, שֶׁנֶּאֱמַר: ״עֵקֶב אֲשֶׁר שָׁמַע אַבְרָהָם בְּקוֹלִי וְגוֹ׳״. אֲמַר לֵיהּ רַב שִׁימִי בַּר חִיָּיא לְרַב: וְאֵימָא שֶׁבַע מִצְוֹת? הָא אִיכָּא נָמֵי מִילָה! וְאֵימָא שֶׁבַע מִצְוֹת וּמִילָה! אֲמַר לֵיהּ: אִם כֵּן ״מִצְוֹתַי וְתוֹרוֹתָי״ לְמָה לִי? אָמַר (רַב), וְאִיתֵּימָא רַב אָשֵׁי: קִיֵּים אַבְרָהָם אָבִינוּ אֲפִילּוּ עֵירוּבֵי תַבְשִׁילִין, שֶׁנֶּאֱמַר: ״תּוֹרוֹתָי״, אַחַת תּוֹרָה שֶׁבִּכְתָב וְאַחַת תּוֹרָה שֶׁבְּעַל פֶּה.
Apropos the previous statement, the Gemara cites that Rav said: Abraham our Patriarch fulfilled the entire Torah before it was given, as it is stated: “Because [ekev] Abraham hearkened to My voice and kept My charge, My mitzvot, My statutes and My Torahs” (Genesis 26:5). Rav Shimi bar Ḥiyya said to Rav: And say that the verse means that he fulfilled only the seven Noahide mitzvot and not the entire Torah. The Gemara asks: But isn’t there also circumcision that Abraham clearly observed, which is not one of the Noahide laws? Apparently, Abraham fulfilled more than just those seven. The Gemara asks: And say that he fulfilled only the seven mitzvot and circumcision. Rav said to him: If so, why do I need the continuation of the verse, that Abraham kept: My mitzvot and My Torah? That is a clear indication that he fulfilled mitzvot beyond the seven Noahide mitzvot, and apparently fulfilled the entire Torah. Rav said, and some say Rav Ashi said: Abraham our Patriarch fulfilled the entire Torah, even the mitzva of the joining of cooked foods, a rabbinic ordinance instituted later, as it is stated: My Torahs. Since the term is in the plural, it indicates that Abraham kept two Torahs; one, the Written Torah, and one, the Oral Torah. In the course of fulfilling the Oral Torah, he fulfilled all the details and parameters included therein.
Kiddushin 82a:10
בְּנַעֲרוּתוֹ מַהוּ אוֹמֵר? ״וְקוֹיֵ ה׳ יַחֲלִיפוּ כֹחַ״. בְּזִקְנוּתוֹ מַהוּ אוֹמֵר? ״עוֹד יְנוּבוּן בְּשֵׂיבָה״, וְכֵן הוּא אוֹמֵר בְּאַבְרָהָם אָבִינוּ: ״וְאַבְרָהָם זָקֵן... וַה׳ בֵּרַךְ אֶת אַבְרָהָם בַּכֹּל״ – מָצִינוּ שֶׁעָשָׂה אַבְרָהָם אָבִינוּ אֶת כָּל הַתּוֹרָה כּוּלָּהּ עַד שֶׁלֹּא נִיתְּנָה, שֶׁנֶּאֱמַר: ״עֵקֶב אֲשֶׁר שָׁמַע אַבְרָהָם בְּקֹלִי וַיִּשְׁמֹר מִשְׁמַרְתִּי מִצְוֹתַי חֻקּוֹתַי וְתוֹרֹתָי״
The mishna explains: With regard to his youth, what does it say about a Torah scholar? “But they that wait for the Lord shall renew their strength” (Isaiah 40:31). With regard to his old age, what does it say? “They shall still bring forth fruit in old age” (Psalms 92:15), and it likewise states with regard to Abraham our forefather: “And Abraham was old, well stricken in age; and the Lord had blessed Abraham in all things” (Genesis 24:1). We found that Abraham our forefather fulfilled the entire Torah before it was given, as it is stated: “Because that Abraham listened to My voice, and kept My charge, My commandments, My statutes, and My laws” (Genesis 26:5), which indicates that Abraham observed all the mitzvot of his own accord and was rewarded in his old age as a result.
Mishneh Torah, Forbidden Intercourse 14:2
Rambam rules that before the giving of the Torah, there were no formal prohibitions of forbidden relations in the same sense as after Sinai, suggesting that the patriarchs were not technically bound by the full Torah law — a position in tension with the view that they observed everything.
אִם חִלַּלְתָּ שַׁבָּת אַתָּה עָנוּשׁ סְקִילָה. וְאֵין מַרְבִּין עָלָיו. וְאֵין מְדַקְדְּקִין עָלָיו. שֶׁמָּא יִגְרֹם לְטָרְדוֹ וּלְהַטּוֹתוֹ מִדֶּרֶךְ טוֹבָה לְדֶרֶךְ רָעָה. שֶׁבַּתְּחִלָּה אֵין מוֹשְׁכִין אֶת הָאָדָם אֶלָּא בְּדִבְרֵי רָצוֹן וְרַכִּים.
We tell him: "Before you came to our faith, if you partook of fat, you were not liable for your soul to be cut off. If you desecrated the Sabbath, you were not liable to be stoned to death. Now, after you convert, if you partake of fat, you are liable for your soul to be cut off. If you desecrate the Sabbath, you are liable to be stoned to death." We do not teach him all the particulars lest this cause him concern and turn him away from a good path to a bad path.
Ramban on Genesis 26:5
Ramban discusses the view that Abraham kept the entire Torah voluntarily while in the Land of Israel, but raises the question of how Jacob could marry two sisters (Leah and Rachel) if he was bound by the Torah's prohibition — offering a nuanced resolution that the patriarchs observed the Torah only in Eretz Yisrael, not in the Diaspora.
וְהַנִּרְאֶה אֵלַי מִדַּעַת רַבּוֹתֵינוּ שֶׁלָּמַד אַבְרָהָם אָבִינוּ הַתּוֹרָה כֻּלָּהּ בְּרוּחַ הַקֹּדֶשׁ, וְעָסַק בָּהּ וּבְטַעֲמֵי מִצְווֹתֶיהָ וְסוֹדוֹתֶיהָ, וְשָׁמַר אוֹתָהּ כֻּלָּהּ כְּמִי שֶׁאֵינוֹ מְצֻוֶּה וְעֹשֶׂה, וּשְׁמִירָתוֹ אוֹתָהּ הָיָה בָּאָרֶץ בִּלְבַד, וְיַעֲקֹב בְּחוּצָה לָאָרֶץ נָשָׂא הָאֲחָיוֹת, וְכֵן עַמְרָם, כִּי הַמִּצְוֹת מִשְׁפַּט אֱלֹהֵי הָאָרֶץ הֵן אַף עַל פִּי שֶׁהֻזְהַרְנוּ בְּחוֹבַת הַגּוּף בְּכָל מָקוֹם (קדושין לו).
The Sons of Noah were commanded concerning all of these matters, and Abraham observed and fulfilled the Will of his Creator, observing even the details and the strictures of their commandments, even as the Sages mentioned: “The tractate of idolatry of our father Abraham contained four hundred chapters.” They further expounded [on the verse referring to Isaac, which says] And he found in that year a hundredfold, that he measured the produce for the purpose of tithing, since the patriarchs were the generous ones of the peoples, giving tithes to the poor or the priests of G-d, such as Shem and Eber and their disciples, just as it is said, And he was a priest of the most high G-d. Now it appears to me from a study of the opinions of our Rabbis that Abraham our father learned the entire Torah by Ruach Hakodesh and occupied himself with its study and the reason for its commandments and its secrets, and he observed it in its entirety as “one who is not commanded but nevertheless observes it.” Furthermore, his observance of the Torah applied only in the Land of Israel
Rashbam on Exodus 18:13
לשפט את העם - אפילו אם בא יתרו קודם מתן תורה דיני ממונות היה להם מעולם. אף כי אמרו רבותינו כי במרה נתנו להם דינים, כדכתיב שם: שם לו חוק ומשפט. ונראים הדברים שאחר מתן תורה בא. כתיב כאן: אשר הוא חנה שם הר האלהים. ולפנינו הוא אומר: בחדש השלישי לצאת בני ישראל מארץ מצרים ביום הזה באו מדבר סיני ויסעו מרפידים ויבאו מדבר סיני ויחן שם ישראל נגד ההר, נמצאת פרשת רפידים וחניית ההר קדמה לפרשה זו וכדי שלא להפסיק בפרשיות של מצות, הקדים פרשת יתרו.
לשפוט את העם. Even if we accept the opinion that Jethro had arrived at the encampment of the Jewish people before the revelation at Mount Sinai, mundane matters had been subject of judgment all the time. Any disagreement concerning people’s property needed adjudication. While it is true that at Marah, prior to the revelation at Sinai, not only social laws but also some ritual laws had been revealed (Exodus 15,25), the opinion that Yitro arrived after the revelation at Mount Sinai is more plausible seeing that we read here of the Israelites being encamped at the Mountain of G’d (verse 5). Moreover, chapter 19 commences with the words: “In the third month after the Exodus on the first of the month the Israelites entered the desert of Sinai after having journeyed from Refidim.” It is clear from there that what happened at Refidim and the encampment at Mount Sinai occurred before what is discussed in our paragraph, but that this paragraph was inserted here in order not to interrupt the portions dealing with all the commandments which commence in chapter 21 after the revelation at Mount Sinai.
Ramban on Torah Genesis 49:3
Ramban elaborates on the status of the patriarchs' observance and addresses the difficulty of Reuven's sin and Jacob's marriages in light of the claim that the patriarchs kept all Torah laws.
Netivot Olam, Netiv Hatorah 1
The Maharal explains that the Torah preceded creation and the patriarchs, as men of supreme spiritual stature, naturally embodied and observed the Torah from within — their observance flowed from their essence rather than from external commandment, anticipating Sinaitic obligation through inner perfection.
Noam Elimelekh, Sefer Bereshit, Vayetzei
Reb Elimelech of Lizhensk addresses Jacob's marriage to two sisters and discusses the Chassidic understanding that the patriarchs' observance of Torah operated on a plane of soul-reality (shoresh haneshama) that transcended the letter of the law, making apparent violations at the level of physical law actually harmonious at a higher spiritual register.
Toldot Yaakov Yosef, Vayetzei
The Toldot discusses the question of Jacob's marriages within a Chassidic framework, exploring the idea that before Sinai the Torah existed in a more spiritual, uncontracted form, and the patriarchs accessed this higher-dimensional Torah that did not yet contain the specific prohibitions of the lower, revealed Torah.
Sefat Emet, Leviticus, Emor 2:1
The Gerrer Rebbe (Sefat Emet) engages with the question of the patriarchs and the Torah's commandments, suggesting that the patriarchs did not observe the Torah as an external legal framework but lived it as an inner reality of divine light — the Torah of Atzilut — which transcends the boundaries of the revealed Torah of Beriah given at Sinai.
תרל"ג
Sefat Emet – Rabbi Yehudah Leib Alter of Ger, translated by Rabbi Arthur Green
Tanya, Part I; Likkutei Amarim 23:7
The Alter Rebbe discusses the unique spiritual level of the patriarchs, noting that they served God with a quality of total self-nullification to the divine that made their observance of Torah an ontological reality rather than a legal obligation — their bodies themselves were described as a 'merkavah' (divine chariot), meaning Torah was their very nature.