Then the LORD instructed Moses: "Come up here to me, and bring along Aaron, Nadab, Abihu, and seventy of Israel's leaders. All of them must worship at a distance.
You alone, Moses, are allowed to come near to the LORD. The others must not come too close. And remember, none of the other people are allowed to climb on the mountain at all."
When Moses had announced to the people all the teachings and regulations the LORD had given him, they answered in unison, "We will do everything the LORD has told us to do."
Then Moses carefully wrote down all the LORD's instructions. Early the next morning he built an altar at the foot of the mountain. He also set up twelve pillars around the altar, one for each of the twelve tribes of Israel.
Then he sent some of the young men to sacrifice young bulls as burnt offerings and peace offerings to the LORD.
Moses took half the blood from these animals and drew it off into basins. The other half he splashed against the altar.