The Talmud expounds 'v'anvehu' as 'ana v'hu' — beautify yourself before Him — and derives that one should perform mitzvot in a beautiful way: a beautiful sukkah, a beautiful lulav, a beautiful shofar, beautiful tzitzit, a beautiful Torah scroll.
דְּתַנְיָא: ״זֶה אֵלִי וְאַנְוֵהוּ״, הִתְנָאֵה לְפָנָיו בְּמִצְוֹת: עֲשֵׂה לְפָנָיו סוּכָּה נָאָה, וְלוּלָב נָאֶה, וְשׁוֹפָר נָאֶה, צִיצִית נָאָה, סֵפֶר תּוֹרָה נָאֶה, וּכְתוֹב בּוֹ לִשְׁמוֹ בִּדְיוֹ נָאֶה, בְּקוּלְמוֹס נָאֶה, בְּלַבְלָר אוּמָּן, וְכוֹרְכוֹ בְּשִׁירָאִין נָאִין. אַבָּא שָׁאוּל אוֹמֵר: ״וְאַנְוֵהוּ״ — הֱוֵי דּוֹמֶה לוֹ, מָה הוּא חַנּוּן וְרַחוּם — אַף אַתָּה הֱיֵה חַנּוּן וְרַחוּם.
What is the source for the requirement of: “This is my God and I will glorify Him”? As it was taught in a baraita with regard to the verse: “This is my God and I will glorify Him [anveihu], the Lord of my father and I will raise Him up.” The Sages interpreted anveihu homiletically as linguistically related to noi, beauty, and interpreted the verse: Beautify yourself before Him in mitzvot. Even if one fulfills the mitzva by performing it simply, it is nonetheless proper to perform the mitzva as beautifully as possible. Make before Him a beautiful sukka, a beautiful lulav, a beautiful shofar, beautiful ritual fringes, beautiful parchment for a Torah scroll, and write in it in His name in beautiful ink, with a beautiful quill by an expert scribe, and wrap the scroll in beautiful silk fabric. Abba Shaul says: Ve’anveihu should be interpreted as if it were written in two words: Ani vaHu, me and Him [God]. Be similar, as it were, to Him, the Almighty: Just as He is compassionate and merciful, so too should you be compassionate and merciful. In any case, there is no proof from Rabbi Yishmael’s statement with regard to the Paschal lamb that he would say the same with regard to circumcision, as in that case, he might agree that fulfilling the mitzva beautifully justifies overriding Shabbat.