Exodus 24:3-5

Darby Translation

³ And Moses came and told the people all the words of Jehovah, and all the judgments; and all the people answered with one voice, and said, All the words that Jehovah has said will we do!

⁴ And Moses wrote all the words of Jehovah, and rose up early in the morning, and built an altar under the mountain, and twelve pillars, according to the twelve tribes of Israel.

⁵ And he sent the youths of the children of Israel, and they offered up burnt-offerings, and sacrificed sacrifices of peace-offering of bullocks to Jehovah.