Exodus 24:6

Moses came and told the people all the LORD’s words, and all the ordinances; and all the people answered with one voice, and said, “All the words which the LORD has spoken will we do.”

Moses wrote all the LORD’s words, then rose up early in the morning and built an altar at the base of the mountain, with twelve pillars for the twelve tribes of Israel.

He sent young men of the children of Israel, who offered burnt offerings and sacrificed peace offerings of cattle to the LORD.

He took the book of the covenant and read it in the hearing of the people, and they said, “We will do all that the LORD has said, and be obedient.”

Moses took the blood, and sprinkled it on the people, and said, “Look, this is the blood of the covenant, which the LORD has made with you concerning all these words.”

Then Moses, Aaron, Nadab, Abihu, and seventy of the elders of Israel went up.