Exodus 16:18-20 International Standard Version (ISV)
18 When they measured it with a vessel the capacity of which was one omer,[a] the one who gathered much did not have an excess, while the one who gathered little did not lack. They gathered exactly what each needed to eat.[b]
19 Then Moses told them, “No one is to leave any of it until morning.” 20 But they did not listen to Moses—some people left part of it until morning, and it produced maggots and smelled bad, so Moses got angry at them.