"Look at the birds of the air: they neither sow nor reap nor gather into barns, and yet your heavenly Father feeds them. Are you not of more value than they?" (Matthew 6:26 ESV)
"Consider the ravens: they neither sow nor reap, they have neither storehouse nor barn, and yet God feeds them. Of how much more value are you than the birds!" (Luke 12:24 ESV)
Interesting how Luke specifically mentions "ravens" in his account of Jesus' exhortation. A word study of the term "raven" (as used in the Bible) is also enlightening. Furthermore, Matthew here calls God "heavenly Father," but Luke just uses "God."