Exodus 16:11

7 and in the morning you will see the LORD’s glory, because He has heard your grumbling against Him. For who are we that you should grumble against us?”

8 And Moses added, “The LORD will give you meat to eat this evening and bread to fill you in the morning, for He has heard your grumbling against Him. Who are we? Your grumblings are not against us but against the LORD.”

9 Then Moses said to Aaron, “Tell the whole congregation of Israel, ‘Come before the LORD, for He has heard your grumbling.’”

10 And as Aaron was speaking to the whole congregation of Israel, they looked toward the desert, and there in a cloud the glory of the LORD appeared.

11 Then the LORD said to Moses,

12 “I have heard the grumbling of the Israelites. Tell them, ‘At twilight you will eat meat, and in the morning you will be filled with bread. Then you will know that I am the LORD your God.’”

13 That evening quail came and covered the camp, and in the morning there was a layer of dew around the camp.

14 When the layer of dew had evaporated, there were thin flakes on the desert floor, as fine as frost on the ground.

15 When the Israelites saw it, they asked one another, “What is it?” For they did not know what it was. So Moses told them, “It is the bread that the LORD has given you to eat.

Read all of Exodus 16