Then the LORD said to Moses, "Come up to the LORD, you and Aaron, Nadab and Abihu, and seventy of Israel's elders, and worship from a distance.
References for Exodus 24:1
Only Moses may come near to the LORD. The others shouldn't come near, while the people shouldn't come up with him at all."
Moses came and told the people all the LORD's words and all the case laws. All the people answered in unison, "Everything that the LORD has said we will do."
Moses then wrote down all the LORD's words. He got up early in the morning and built an altar at the foot of the mountain. He set up twelve sacred stone pillars for the twelve tribes of Israel.
He appointed certain young Israelite men to offer entirely burned offerings and slaughter oxen as well-being sacrifices to the LORD.
Moses took half of the blood and put it in large bowls. The other half of the blood he threw against the altar.