Luke 12:26

"If then you cannot do even that which is least, why are you anxious concerning the rest?

Luke 12:29

"So do not be asking what ye shall eat, or what ye shall drink, and be not of doubtful mind.

1 Peter 5:7

Cast all your care upon him, for he ever cares for you.

Treasury of Scripture Knowledge

Summary

If ye then be not able to do that thing which is least, why take ye thought for the rest?

Bible References

Why

Luke 12:29
"So do not be asking what ye shall eat, or what ye shall drink, and be not of doubtful mind.
1 Peter 5:7
Cast all your care upon him, for he ever cares for you.