C. F. Keil and Franz Delitzsch on 1 Samuel 27:1

1Sa 27:1

The result of the last affair with Saul, after his life had again been spared, could not fail to confirm David in his conviction that Saul would not desist from pursuing him, and that if he stayed any longer in the land, he would fall eventually into the hands of his enemy. With this conviction, he formed the following resolution: “Now shall I be consumed one day by the hand of Saul: there is no good to me (i.e., it will not be well with me if I remain in the land), but (כּי after a negative) I will flee into the land of the Philistines; so will Saul desist from me to seek me further (i.e., give up seeking me) in the whole of the territory of Israel, and I shall escape his hand.”