Vayikra — The Lechem HaPanim Command
Leviticus 24:5-9
The Torah commands twelve loaves to be arranged on the golden table, explicitly stating 'twelve loaves' corresponding to the twelve tribes of Israel, and they are to be set before God continually on behalf of the Children of Israel.
וְלָקַחְתָּ֣ סֹ֔לֶת וְאָפִיתָ֣ אֹתָ֔הּ שְׁתֵּ֥ים עֶשְׂרֵ֖ה חַלּ֑וֹת שְׁנֵי֙ עֶשְׂרֹנִ֔ים יִהְיֶ֖ה הַֽחַלָּ֥ה הָאֶחָֽת׃ וְשַׂמְתָּ֥ אוֹתָ֛ם שְׁתַּ֥יִם מַֽעֲרָכ֖וֹת שֵׁ֣שׁ הַֽמַּעֲרָ֑כֶת עַ֛ל הַשֻּׁלְחָ֥ן הַטָּהֹ֖ר לִפְנֵ֥י יְהֹוָֽה׃
You shall take choice flour and bake of it twelve loaves, two-tenths of a measure for each loaf. Place them on the pure table before GOD in two rows, six to a row.
Why it matters — The foundational text establishing the number twelve; the phrase 'from the Children of Israel' (מאת בני ישראל) implies the tribal correspondence is embedded in the plain meaning of the commandment.