1Sam 27:2

“"What," you say, "have you to do with the kings of this world, in whom Christianity has never found anything save envy toward it?" Having said this, you endeavored to reckon up what kings the righteous had found to be their enemies, and [you] did not consider how many more might be enumerated who have proved their friends. The patriarch Abraham was both most friendly treated, and presented with a token of friendship, by a king who had been warned from heaven not to defile his wife. Isaac his son likewise found a king most friendly to him. Jacob, being received with honor by a king in Egypt, went so far as to bless him. What shall I say of his son Joseph, who, after the tribulation of a prison, in which his chastity was tried as gold is tried in the fire, being raised by Pharaoh to great honors, even swore by the life of Pharaoh4—not as though puffed up with vain conceit but being not unmindful of his kindness. The daughter of a king adopted Moses. David took refuge with a king of another race, compelled thereto by the unrighteousness of the king of Israel.”

“And David arose, and he went himself, etc. The Lord leaves the seat which He used to hold in the hearts of the Jews from ancient times and went to acquire the Gentiles for His faith, He himself and the ministers of His word, notable by their multiplicity, that is, intent on perfect work in this present time, and suspended in their mind by the undoubted hope of heavenly things in the future.”

“Achish, the son of Maoch, king of Gath--The popular description of this king's family creates a presumption that he was a different king from the reigning sovereign on David's first visit to Gath. Whether David had received a special invitation from him or a mere permission to enter his territories, cannot be determined. It is probable that the former was the case. From the universal notoriety given to the feud between Saul and David, which had now become irreconcilable, it might appear to Achish good policy to harbor him as a guest, and so the better pave the way for the hostile measures against Israel which the Philistines were at this time meditating.”