Exodus 24:1-8

1 And he said unto Moses, Come up unto the LORD, thou and Aaron, Nadab, and Abihu and seventy of the elders of Israel, and worship afar off.
2 And Moses alone shall approach the LORD, but they shall not come near; neither shall the people go up with him.
3 And Moses came and told the people all the words of the LORD and all the rights, and all the people answered with one voice and said, All the words which the LORD has said we will do.
4 And Moses wrote all the words of the LORD and rose up early in the morning and built an altar at the foot of the mount and twelve pillars, according to the twelve tribes of Israel.
5 And he sent the young men of the sons of Israel, who had offered burnt offerings and sacrificed peace offerings of bullocks unto the LORD.
6 And Moses took half of the blood and put it in basins, and half of the blood he sprinkled on the altar.
7 And he took the book of the covenant and read in the audience of the people, and they said, All that the LORD has said we will do, and we will hear.
8 Then Moses took the blood and sprinkled it on the people and said, Behold the blood of the covenant, which the LORD has made with you concerning all these words.