Exodus 16:13

As Aaron spoke to the whole congregation of the children of Israel, they looked toward the wilderness, and behold, the LORD’s glory appeared in the cloud.

The LORD spoke to Moses, saying,

“I have heard the murmurings of the children of Israel. Speak to them, saying, ‘At evening you shall eat meat, and in the morning you shall be filled with bread. Then you will know that I am the LORD your God.’”

When the dew that lay had gone, behold, on the surface of the wilderness was a small round thing, small as the frost on the ground.

When the children of Israel saw it, they said to one another, “What is it?” For they didn’t know what it was. Moses said to them, “It is the bread which the LORD has given you to eat.

This is the thing which the LORD has commanded: ‘Gather of it everyone according to his eating; an omer a head, according to the number of your persons, you shall take it, every man for those who are in his tent.’”