Exodus 16:14-20

When the layer of dew evaporated, on the surface of the wilderness there was a fine, flake-like thing, as fine as frost on the ground. When the Israelites saw it, they said to one another, “What is it?” For they did not know what it was. And Moses said to them, “This is the bread which the LORD has given you to eat. [John 6:31, 33] This is what the LORD has commanded: ‘Let every man gather as much of it as he needs. Take an omer for each person, according to the number of people each of you has in his tent.’ ” The Israelites did so, and some gathered much [of it] and some [only a] little. When they measured it with an omer, he who had gathered a large amount had no excess, and he who had gathered little had no lack; every man gathered according to his need (family size). Moses said, “Let none of it be left [overnight] until [the next] morning.” But they did not listen to Moses, and some left a supply of it until morning, and it bred worms and became foul and rotten; and Moses was angry with them.