Exodus 16:4, 8

Then the LORD said to Moses, “Behold, I will rain bread from heaven for you. And the people shall go out and gather a certain quota every day, that I may test them, whether they will walk in My law or not.

Also Moses said, “This shall be seen when the LORD gives you meat to eat in the evening, and in the morning bread to the full; for the LORD hears your complaints which you make against Him. And what are we? Your complaints are not against us but against the LORD.”