Adam Clarke on Psalms 17:13

Arise, O Lord, disappoint him - When he arises to spring upon and tear me to pieces, arise thou, O Lord; disappoint him of his prey; seize him, and cast him down.

Deliver my soul - Save my life.

From the wicked, which is thy sword - Saul is still meant, and we may understand the words as either implying the sword, the civil power, with which God had intrusted him, and which he was now grievously abusing; or, it may mean, deliver me by Thy sword - cut him off who wishes to cut me off. On this ground the next verse should be read from men, By thy hand. So the margin. The hand of God not only meaning his power, but his providence.