The Philistines had feared David more than Saul. By placing himself under the protection of the Philistines, David revealed to them the weakness of his own people. Thus he encouraged these determined enemies to persecute Israel. David had been anointed to stand in defense of the people of God. The Lord does not want His servants to give encouragement to the wicked by exposing the weakness of His people. BOE 339.7
In addition, the Israelites received the impression that David had gone to the heathen to serve their gods. By this act, many were led to be prejudiced against him. The very thing Satan desired to have him do, he was led to do. David did not renounce his worship of God nor devotion to His cause, but he sacrificed his trust in Him for his personal safety. BOE 339.8
The king of the Philistines received David cordially. The king admired him and was flattered to have a Hebrew seek his protection. David brought his family, his household, and all his possessions, as his men did also. To all appearances he had come to settle permanently in the land of Philistia. This flattered Achish, who promised to protect the fugitive Israelites. BOE 339.9
At David’s request, the king graciously granted him Ziklag as a possession. In a town wholly separated for their use, David and his men could worship God with more freedom than in Gath, where heathen rites might become a source of evil. BOE 340.1
While living in this isolated town David made war on the Geshurites, the Girzites, and the Amalekites, and left none alive to bring the report to Gath. He led Achish to believe that he had been warring against his own nation, the men of Judah. By these lies he strengthened the hand of the Philistines, for the king said, “He has made his people Israel utterly abhor him; therefore he will be my servant forever.” David was not walking in the counsel of God when he was deceptive. BOE 340.2
“Now it happened in those days that the Philistines gathered their armies together for war, to fight with Israel. And Achish said to David, ‘You assuredly know that you will go out with me to battle, you and your men.’” David answered the king evasively, “Surely you know what your servant can do.” Achish pledged his word to bestow on David a high position at the Philistine court. BOE 340.3
But although David’s faith had somewhat hesitated regarding the promises of God, he still remembered that Samuel had anointed him king of Israel. He reviewed the mercy of God in preserving him from 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. BOE 340.4