Exodus 16:10-14

And it came about, as Aaron spoke to the entire congregation of the sons of Israel, that they looked toward the wilderness, and behold, the glory of the Lord appeared in the cloud.

And the Lord spoke to Moses, saying,

“I have heard the grumblings of the sons of Israel; speak to them, saying, ‘At twilight you shall eat meat, and in the morning you shall be filled with bread; and you shall know that I am the Lord your God.’ ”

So it came about at evening that the quails came up and covered the camp, and in the morning there was a layer of dew around the camp.

When the layer of dew evaporated, behold, on the surface of the wilderness there was a fine flake-like thing, fine as the frost on the ground.