“Will you lead me to these raiders?” David asked. And the man replied, “Swear to me by God that you will not kill me or deliver me into the hand of my master, and I will lead you to them.”
Solomon observes that the righteous is delivered out of trouble and the wicked cometh in his stead, that the just falleth seven times a-day and riseth again; so it was with David. Many were his troubles, but the Lord delivered him out of them all, and particularly out of this of which we have here an account. I.
Commenting on 1 Samuel 30:7-20
And David said unto him, canst thou me down to this company?.... That is, show him, or direct him where they were: and he said, swear unto me by God; the Targum is, by the Word of the Lord; but it is highly probable this man had no notion of Jehovah, and his Word, or of the true God; only that there was a God...
Swear unto me by God--Whether there was still among these idolatrous tribes a lingering belief in one God, or this Egyptian wished to bind David by the God whom the Hebrews worshipped, the solemn sanction of an oath was mutually recognized.