Exodus 16:20

Some of them left of it till the morning Either distrusting God's providence, for a future supply, or out of curiosity to learn the nature of this manna, and what they might do if occasion required; it bred worms and stank Not so much of its own nature, which was pure and durable, as from God's judgment. Thus will that be corrupted in which we do not trust in God, and which we do not employ for his glory.