Exodus 16:19

“And Moses said unto them, etc.] At the same time he gave the direction to them about gathering it, and measuring out to every man an omer: let no man leave of it until the morning; not that every man was bound to eat up the quantity distributed to him; he might give what he could not eat to those that could eat more, if there were any such; or he might give it to his cattle, or cast it away, but he was not to reserve it until the next day for his use; which was to teach him that God would bestow this benefit and blessing on him daily, and he might expect it, whose mercies are new every morning; and to instruct him to live every day upon the providence of God for his daily food; as indeed…”

“Let no man leave 'till morning - But let them learn to go to bed and sleep quietly, though they had not a bit of bread in their tent, nor in all their camp, trusting God with the following day to bring them their daily bread. Never was there such a market of provisions as this, where so many hundred thousand men were daily furnished without money, and without price: never was there such an open house kept as God kept in the wilderness for 40 years together, nor such free and plentiful entertainment given. And the same wisdom, power and goodness that now brought food daily out of the clouds, doth in the constant course of nature bring food yearly out of the earth, and gives us all things…”

“16:19-20 Regarding these instructions, see study note on 16:4-5.”

“Exo 12:10, Exo 23:18; Mat 6:34 Exodus 16:20”

“In the second place, Moses commanded them, that no one was to leave any of what had been gathered till the next morning. Some of them disobeyed, but what was left went into worms (תּולעים ירם literally rose into worms) and stank. Israel was to take no care for the morrow ( Mat 6:34), but to enjoy the daily bread received from God in obedience to the giver. The gathering was to take place in the morning ( Exo 16:21); for when the sun shone brightly, it melted away. Exodus 16:22”