Charles Ellicott Commentary 1 Samuel 30:23

"Then said David, Ye shall not do so, my brethren, with that which Jehovah hath given unto us, who hath preserved us, and delivered the troop that came against us into our hand." — 1 Samuel 30:23 (ASV)

You shall not do so, my brothers. —Translate “Do not so, my brothers, with that which the Lord has given us,” that is, “in respect to that which the Lord,” etc. Ewald prefers to render the phrase as an ejaculatory oath, “By that which the Lord,” etc. Some commentators here quote a passage from Polybius, where a similar scene is depicted as having taken place after the capture of Nova Carthago. In this account, Publius Scipio decided that the spoil then taken should be divided equally among the troops that had actually been engaged, the reserves, the sick among the soldiers, and those in the army who had been detached from the main body on special service.