Exodus 16:13-15

13So at evening quail came and covered the camp. In the morning there was a layer of dew all around the camp.

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

15When the Israelites saw it, they asked one another, “What is it?” because they didn’t know what it was. Moses told them, “It is the bread the Lord has given you to eat.