They gathered it morning by morning, each as much as he needed to eat, and when the sun grew hot, it melted. Bible see other translations

“and when the sun grew hot, it melted.” The manna was free for the taking, but it did not encourage laziness because it melted when the sun got hot, which occurred quite early in the morning. People needed to get up and get to work gathering it if they wanted food for the day.

Commentary for: Exodus 16:21