Exodus 16:2-4, 20, 28

And the whole congregation of the people of Israel grumbled against Moses and Aaron in the wilderness, and the people of Israel said to them, “Would that we had died by the hand of the LORD in the land of Egypt, when we sat by the meat pots and ate bread to the full, for you have brought us out into this wilderness to kill this whole assembly with hunger.” Then the LORD said to Moses, “Behold, I am about to rain bread from heaven for you, and the people shall go out and gather a day’s portion every day, that I may test them, whether they will walk in my law or not.

But they did not listen to Moses. Some left part of it till the morning, and it bred worms and stank. And Moses was angry with them.

And the LORD said to Moses, “How long will you refuse to keep my commandments and my laws?