And gave... — Literally, and gave them to drink as it were a great deep, or as we might say, “oceans of drink” — a poetical exaggeration; or are we rather to think of the gift of water as produced by striking or boring through the rock to the great ocean on which the earth was supposed to rest?
Related Commentaries of Psalms 78:15
Psalms 78:15
15 He clave the rocks in the wilderness, and gave them drink as out of the great depths.