Exodus 16:19

15 When the Israelites saw it, they asked one another, “What is it?” For they did not know what it was. So Moses told them, “It is the bread that the LORD has given you to eat.

16 This is what the LORD has commanded: ‘Each one is to gather as much as he needs. You may take an omer for each person in your tent.’”

17 So the Israelites did this. Some gathered more, and some less.

18 When they measured it by the omer, he who gathered much had no excess, and he who gathered little had no shortfall. Each one gathered as much as he needed to eat.

19 Then Moses said to them, “No one may keep any of it until morning.”

20 But they did not listen to Moses; some people left part of it until morning, and it became infested with maggots and began to smell. So Moses was angry with them.

21 Every morning each one gathered as much as was needed, and when the sun grew hot, it melted away.

22 On the sixth day, they gathered twice as much food—two omers per person—and all the leaders of the congregation came and reported this to Moses.

23 He told them, “This is what the LORD has said: ‘Tomorrow is to be a day of complete rest, a holy Sabbath to the LORD. So bake what you want to bake, and boil what you want to boil. Then set aside whatever remains and keep it until morning.’”

Read all of Exodus 16