Exodus 16:13-16

13And it came to pass in the evening, that quails came up, and covered the camp; and in the morning the dew lay round the camp.

14And when the dew that lay [round it] was gone up, behold, on the face of the wilderness there was [something] fine, granular, fine as hoar-frost, on the ground.

15And the children of Israel saw [it], and said one to another, What is it? for they did not know what it was. And Moses said to them, This is the bread which Jehovah has given you to eat.

16This is the thing which Jehovah has commanded: Gather of it every man according to what he can eat, an omer a poll, [according to] the number of your persons: ye shall take every man for those that are in his tent.