Exodus 16:18-20

16:18 When they measured with an omer, the one who gathered much had nothing left over, and the one who gathered little lacked nothing; each one had gathered what he could eat.

16:19 Moses said to them, “No one is to keep any of it until morning.” 16:20 But they did not listen to Moses; some kept part of it until morning, and it was full of worms and began to stink, and Moses was angry with them.