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1 Samuel 27:2ESV·author unknown

So David arose and went over, he and the six hundred men who were with him, to Achish the son of Maoch, king of Gath.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. The prevalency of David's fear, which was the effect of the weakness of his faith (Sa1 27:1): He said to his heart (so it may be read), in his communings with it concerning his present condition, I shall now perish one day by the hand of Saul.

Commenting on 1 Samuel 27:1-7

John Gill Reformed Baptist @doctorgill

And David arose,.... From the place where he was: and he passed over; the borders of land of Canaan: with the six hundred men that were with him; having neither lost any, nor had any added to him, since he was at Keilah, Sa1 23:13, unto Achish, the son of Maoch, king of Gath; whether this was the same Achish David was with before, Sa1...

Jamieson-Fausset-Brown Reformed @jfbcommentary

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.