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Matthew Henry's Commentary – Verses 8–12
Verses 8–12

Here is an account of David’s actions while he was in the land of the Philistines, a fierce attack he made upon some remains of the devoted nations, his success in it, and the representation he gave of it to Achish. 1. We may acquit him of injustice and cruelty in this action because those people whom he cut off were such as heaven had long since doomed to destruction, and he that did it was one whom heaven had ordained to dominion; so that the thing was very fit to be done, and he was very fit to do it. It was not for him that was anointed to fight the Lord’s battles to sit still in sloth, however he might think fit, in modesty, to retire. He desired to be safe from Saul only that he might expose himself for Israel. He avenged an old quarrel that God had with these nations, and at the same time fetched in provisions for himself and his army, for by their swords they must live. The Amalekites were to be all cut off. Probably the Geshurites and Gezrites were branches of Amalek. Saul was rejected for sparing them, David makes up the deficiency of his obedience before he succeeds him. He smote them, and left none alive, 1 Sam. 27:8, 9. The service paid itself, for they carried off abundance of spoil, which served for the subsistence of David’s forces. 2. Yet we cannot acquit him of dissimulation with Achish in the account he gave him of this expedition. (1.) David, it seems, was not willing that he should know the truth, and therefore spared none to carry tidings to Gath (1 Sam. 27:11), not because he was ashamed of what he had done as a bad thing, but because he was afraid, if the Philistines knew it, they would be apprehensive of danger to themselves or their allies by harbouring him among them and would expel him from their coasts. It would be easy to conclude, If so he did, so will be his manner, and therefore he industriously conceals it from them, which, it seems, he could do by putting them all to the sword, for none of their neighbours would inform against him, nor perhaps would soon come to the knowledge of what was done, intelligence not being so readily communicated then as now. (2.) He hid it from Achish with an equivocation not at all becoming his character. Being asked which way he had made his sally, he answered, Against the south of Judah, 1 Sam. 27:10. It was true he had invaded those countries that lay south of Judah, but he made Achish believe he had invaded those that lay south in Judah, the Ziphites for example, that had once and again betrayed him; so Achish understood him, and thence inferred that he had made his people Israel to abhor him, and so riveted himself in the interest of Achish. The fidelity of Achish to him, his good opinion of him, and the confidence he put in him, aggravate his sin in deceiving him thus, which, with some other such instances, David seems penitently to reflect upon when he prays, Remove from me the way of lying.