And it was told Saul that David was come to Keilah. And Saul said, God has delivered him into my hand; for he is shut in, by entering into a town that has gates and bars.
Read Chapter 23
George Leo Haydock
Bars. This was what David's men apprehended. Saul thinks this is a fit opportunity for taking them all prisoners; and he supposes that God was on his side, though, after his repeated crimes, he had little reason to flatter himself with hopes of this nature. The wicked, however, easily delude themselves. (Haydock)