Then He said to Moses, "Go up to the Lord, you and Aaron, Nadab, and Abihu, and 70 of Israel's elders, and bow in worship at a distance.
References for Exodus 24:1
Moses alone is to approach the Lord, but the others are not to approach, and the people are not to go up with him."
Moses came and told the people all the commands of the Lord and all the ordinances. Then all the people responded with a single voice, "We will do everything that the Lord has commanded."
And Moses wrote down all the words of the Lord. He rose early the next morning and set up an altar and 12 pillars for the 12 tribes of Israel at the base of the mountain.
Then he sent out young Israelite men, and they offered burnt offerings and sacrificed bulls as fellowship offerings to the Lord.
Moses took half the blood and set it in basins; the [other] half of the blood he sprinkled on the altar.