Exodus 16:15

16:15 When the Israelites saw it, they said to one another, “What is it?” because they did not know what it was. Moses said to them, “It is the bread that the Lord has given you for food.

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.