John Gill Commentary Exodus 16:24

"And they laid it up till the morning, as Moses bade: and it did not become foul, neither was there any worm therein." — Exodus 16:24 (ASV)

And they laid it up until the morning, as Moses commanded
What was left of two omers a man, what they had neither baked nor boiled:

and it did not stink, neither was there any worm in it ,
which was the case, when it was left or laid up on other days; and it showed that there was an interposition of divine Providence in the keeping of it to this day, and clearly confirmed it to be the will of God that this day should henceforward be to them the rest of the holy sabbath.