Exodus 12:27

12:27 then you will say, ‘It is the sacrifice of the Lord’s Passover, when he passed over the houses of the Israelites in Egypt, when he struck Egypt and delivered our households.’” The people bowed down low to the ground,

Exodus 18:12

18:12 Then Jethro, Moses’ father-in-law, brought a burnt offering and sacrifices for God, and Aaron and all the elders of Israel came to eat food with the father-in-law of Moses before God.

Exodus 29:28

29:28 It is to belong to Aaron and to his sons from the Israelites, by a perpetual ordinance, for it is a contribution. It is to be a contribution from the Israelites from their peace offerings, their contribution to the Lord.