David and his men went up, and made a raid on the Geshurites, and the Girzites, and the Amalekites; for those [nations] were the inhabitants of the land, who were of old, as you go to Shur, even to the land of Egypt.
There is no way to gloss over David's sin in this.  He lied continually about what he was really doing.  Achish who believed David, trusted him and aided him was shamefully betrayed and deceived by David.  As Willis stated it, "Like Saul and Nabal who returned to David evil for good, so David here returned to Achish evil for good."[15]  Matthew Henry supposed that David's conscience must have hurt him because of all this, because of what is written in  Psalms 119:29, "Remove from me the way of lying (KJV)."  (Henry ascribed this Psalm to David).[16]