But turned back
 From God and his worship, apostatized from the true religion, and turned to idols: 
 and dealt unfaithfully, like their fathers;
 in the wilderness; see ( Psalms 78:8 Psalms 78:36 Psalms 78:37 ) , 
 they were turned aside like a deceitful bow;
 that promises well to carry the arrow right, but drops it at the feet of the archer; or carries it another way, so that it misses the mark, The Targum is, 
``as a bow casting arrows;''to the ground, and not to the mark; see ( Hosea 7:16 ) , or being too much stretched is suddenly broken, and kills the archer; or returns to its own nature; so Arama.