1 Samuel 24:11-13

My father. David thus salutes Saul not because he was actually his father-in-law, but as a title indicative of the respect due from an inferior to his superior ( 2 Kings 5:13 ). So David calls himself Nabal's son ( 1 Samuel 25:8 ). In the rest of the verse he contrasts his refusal to slay Saul, when it might have seemed as if it were Providence that had put him into his power, with Saul's determined pursuit of him. Thou huntest my soul to take it. Thou perpetually usest every artifice and stratagem against me for the confessed purpose of killing me, and pursuest me as eagerly as the hunter pursues his game. Hence David commits his cause to Jehovah, in the sure confidence that he will avenge him, and with the firm determination never himself to raise his hand against one who, though his enemy, was also the king. In proof of the impossibility of his ever seeking the king's hurt, he quotes an ancient proverb, "From the wicked goeth out wickedness." Had David harboured evil intentions he would have executed them when so fair an opportunity offered, but as he has no such purposes "his hand will never be" upon Saul.