Exodus 24:1-4

Then the LORD instructed Moses: “Come up here to me, and bring along Aaron, Nadab, Abihu, and seventy of Israel’s elders. All of you must worship from a distance. Only Moses is allowed to come near to the LORD. The others must not come near, and none of the other people are allowed to climb up the mountain with him.” Then Moses went down to the people and repeated all the instructions and regulations the LORD had given him. All the people answered with one voice, “We will do everything the LORD has commanded.” Then Moses carefully wrote down all the LORD’s instructions. Early the next morning Moses got up and built an altar at the foot of the mountain. He also set up twelve pillars, one for each of the twelve tribes of Israel.