"And he sent forth a raven" (Gen. viii. 7). The raven remonstrated, remarking, " From all the cattle, beasts, and fowls thou sendest none but me. " What need has the world for thee? • retorted Noah; " thou art good neither for food nor for sacrifice." Rabbi Eliezer says God ordered Noah to receive the raven, as the world would one day be in need of him. " When? asked Noah. " When the waters are dried up from off the earth, there will in a time to come arise a certain righteous man who shall dry up the world, and then I shall want it." This explains what is written (1 Kings xvii. 6), "And the ravens brought him bread and flesh in the morning.
Why Noah Took the Raven Aboard the Ark
Pirkei deRabbi Eliezer 23 (Harris, Hebraic Literature, 1901)