Reference for Deuteronomy 27:1

וַיְצַ֤ו מֹשֶׁה֙ וְזִקְנֵ֣י יִשְׂרָאֵ֔ל אֶת־הָעָ֖ם לֵאמֹ֑ר שָׁמֹר֙ אֶת־כָּל־הַמִּצְוָ֔ה אֲשֶׁ֧ר אָנֹכִ֛י מְצַוֶּ֥ה אֶתְכֶ֖ם הַיּֽוֹם׃

And Moses and the elders of Israel commanded the people, saying: ‘Keep all the commandment which I command you this day.

BDB