1 Samuel 27:9

And left neither man nor woman alive. — These acts of ferocious barbarity are simply without excuse; the reason for them is told us in 1 Samuel 27:11. No captive was to be left alive to tell the tale to King Achish, who was under the delusion that David’s feats of arms were carried out at the expense of his own countrymen, whose lands he was harrying. At this the Philistine rejoiced when he heard David was thus burning his only bridge of retreat: by alienating by these cruelties the affection of the people of Israel, by means of which, at some future time, he might have been recalled to his native land. There were a few occasions in the history of the chosen race when a war of extermination was commended. Then Israel was simply the stern instrument of wrath, used — as a pestilence is at times — to carry out the will of the earth’s Master; but David had no such charge. Was it not these acts of ruthless cruelty which left on this king’s hands the stain of blood which rendered them unfit in after days to build the House of the Lord he longed so passionately to erect? (1 Crônicas 28:3).

And took away the sheep, and the oxen, and the asses, and the camels, and the apparel. — To fight under David’s banner now promised to be a lucrative service as well as an adventurous and wild career. Here at Ziklag, and for some time previously, we hear of brave discontented spirits from all parts of Israel joining him. In 1 Crônicas 12 we have a long and accurate list of heroes who formed that Ziklag band. Amongst these gallant soldiers who now, to use the chronicler’s term, “day by day came to David to help him,” were a troop of Benjamites who had joined him some time before: their leader Amasai, on being questioned as to their reason for joining him, answered, “We are on thy side, thou son of Jesse... for thy God helpeth thee” (1 Crônicas 12:18). The words of Amasai express the feeling which seems to have pervaded Israel at that time in reference to David. The people throughout the land were coming to feel that Jehovah had indeed chosen David. The chronicler even speaks of David’s band at Ziklag, after the recruits from all parts of Israel had poured in, “as a great host, like the host of God” (1 Crônicas 12:22).