Exodus 16:19

Let no man leave of it. God had provided the Israelites with food for which they had not labored, but He did not want them to become lazy. They must gather every day in order to have anything to eat. Furthermore, they must rise early, since the manna melted “when the sun waxed hot” (v. 21). Although there were no fields to plow or harvests to bring in, the fact that they must arise early to gather their food shows that God planned every detail of this phenomenon for the people’s benefit and training. Poverty and want are the reward of those who sleep late (see Prov. 6:9-11).