1 Samuel 29:6-7

As Jehovah liveth. These words are strange in the mouth of a Philistine, nor can we suppose that out of respect to David he would thus swear by David's God. Probably they are the equivalent of the oath which Achish really used. He sends, however, David away with the utmost courtesy, assuring him that his own wish had been that he should remain with him, because all his conduct had been upright since he had come to him at Gath.