Reference for Psalms 78:34

אִם־הֲרָגָ֥ם וּדְרָשׁ֑וּהוּ וְ֝שָׁ֗בוּ וְשִֽׁחֲרוּ־אֵֽל׃

When He slew them, then they would inquire after Him, And turn back and seek God earnestly.

ספר השרשים