Exodus 24:2-8

ISV(i) 2 Only Moses is to approach the LORD, but the others are not to approach; the people are not to come up with him.”
3 Then Moses came and reported all the words of the LORD and all the statutes to the people, and they all answered with one voice, “We will do everything that the LORD has decreed.”
4 So Moses wrote down all the words of the LORD. He got up early in the morning and built an altar with twelve pillars for the twelve tribes of Israel at the base of the mountain. 5 He sent young Israeli men to offer up burnt offerings and sacrifice bulls as peace offerings to the LORD. 6 Moses took half the blood and put it in bowls, while he sprinkled the other half on the altar. 7 He took the Book of the Covenant and read it to the people. They said, “We will put into practice and obey everything that the LORD has decreed.”
8 Moses took the blood, sprinkled it on the people, and said, “This is the blood of the covenant that the LORD made with you based on all these words.”