They gathered it every morning. Each gathered as much as he needed to eat, but when the sun grew hot, it melted.
Exodus 16:21 In-Context
Then Moses said to them, “No one is to keep any of it until morning.”
However, some of them paid no attention to Moses; they kept part of it until morning, but it was full of maggots and began to smell. So Moses was angry with them.
Each morning everyone gathered as much as they needed, and when the sun grew hot, it melted away.
On the sixth day, they gathered twice as much—two omers for each person—and the leaders of the community came and reported this to Moses.
He said to them, “This is what the LORD commanded: ‘Tomorrow is to be a day of sabbath rest, a holy sabbath to the LORD. So bake what you want to bake and boil what you want to boil. Save whatever is left and keep it until morning.’ ”