The Philistines gathered their armies together - Sir Isaac Newton conjectures that the Philistines had got a great increase to their armies by vast numbers of men which Amasis had driven out of Egypt. This, with Samuel's death, and David's disgrace, were no inconsiderable motives to a new war, front which the Philistines had now every thing to hope.
Thou shalt go out with me to battle - This he said, being deceived by what David had told him.
“And it came to pass in those days, that the Philistines gathered their armies together for warfare, to fight with Israel. And Achish said unto David, Know thou assuredly, that thou shalt go out with me to battle, thou and thy men.” David had no intention of lifting his hand against his people; but he was not certain as to what course he would pursue, until circumstances should indicate his duty. He answered the king evasively, and said, “Surely thou shalt know what thy servant can do.” Achish understood these words as a promise of assistance in the approaching war, and pledged his word to bestow upon David great honor, and give him a high position at the Philistine court. PP 674.1
But although David's faith had staggered somewhat at the promises of God, he still remembered that Samuel had anointed him king of Israel. He recalled the victories that God had given him over his enemies in the past. He reviewed the great mercy of God in preserving him from the hand of Saul, and determined not to betray a sacred trust. Even though the king of Israel had sought his life, he would not join his forces with the enemies of his people. PP 674.2
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