ישעיהו נה:י פירוש: רש״י ואבן עזרא

For, just as the rain and the snow fall and do not return empty, but do good for you.

For as the rain cometh down, etc. The rain watereth the earth, in coming down from heaven; for that purpose God sends it down, in order that seed may be given to the sower and bread to the eater.