Then Jonah prayed to Yahweh, his God, out of the fish's belly.
All that is actually proved by these similarities is that Jonah was steeped in a thorough knowledge of the devotional language of God's people.  Keil was correct in his flat denial that Jonah's prayer was in any way "compounded from passages in the Psalms."[5]  Knobel and DeWette, as quoted by Keil, affirm that: