Exodus 24:5

Then Jethro, Moses’ father-in-law, took a burnt offering and sacrifices for God, and Aaron came with all the elders of Israel to eat a meal with Moses’ father-in-law before God.

“Also let the priests who come near to Yahweh set themselves apart as holy, lest Yahweh break out against them.”

‘You shall make an altar of earth for Me, and you shall sacrifice on it your burnt offerings and your peace offerings, your sheep and your oxen; in every place where I cause My name to be remembered, I will come to you and bless you.

which I commanded your fathers in the day that I brought them out of the land of Egypt, from the iron furnace, saying, ‘Listen to My voice, and do according to all which I command you; so you shall be My people, and I will be your God,’