Exodus 24:1-4

The LORD told Moses, “You, Aaron, Nadab, Abihu, and seventy of the elders of Israel must come up to me and worship me from a distance. Then Moses alone must come near me; the others must not come near. The rest of the people must not come up the mountain with Moses.” Moses told the people all the LORD’s words and laws for living. Then all of the people answered out loud together, “We will do all the things the LORD has said.” So Moses wrote down all the words of the LORD. And he got up early the next morning and built an altar near the bottom of the mountain. He set up twelve stones, one stone for each of the twelve tribes of Israel.