Genesis 14:22

22.And Abram said to the king of Sodom, I have lift up mine hand, etc (368) This ancient ceremony was very appropriate to give expression to the force and nature of an oath. For by raising the hand towards heaven, we show that we appeal to God as a witness, and also as an avenger, if we fail to keep our oath. Formerly, indeed, they raised their hands in giving votes; whence the Greeks derive the word ( χειροτονεῖν,) (369) which signifies to decree: but in the rite of swearing, the reason for doing so was different. For men hereby declared, that they regarded themselves as in the presence of God, and called upon him to be both the Guardian of truth, and the Avenger of perjury. Yet it may seem strange that Abram should so easily have put himself forward to swear; for he knew that a degree of reverence was due to the name of God, which should constrain us to use it but sparingly, and only from necessity. I answer, there were two reasons for his swearing. First, since inconstant men are wont to measure others by their own standard, they seldom place confidence in bare assertions. The king of Sodom, therefore, would have thought that Abram did not seriously remit his right, unless the name of God had been interposed. And, secondly, it was of great consequence, to make it manifest to all, that he had not carried on a mercenary war. The histories of all times sufficiently declare, that even they who have had just causes of war have, nevertheless, been invited to it by the thirst of private gain. And as men are acute in devising pretexts, they are never at a loss to find plausible reasons for war, even though covetousness may be their only real stimulant. Therefore, unless Abram had resolutely refused the spoils of war, the rumor would immediately have spread, that, under the pretense of rescuing his nephew, he had been intent upon grasping the prey. Against which it was necessary for him carefully to guard, not so much for his own sakes as for the glory of God, which would otherwise have received some mark of disparagement. Besides, Abram wished to arm himself with the name of God, as with a shield, against all the allurements of avarice. For the king of Sodom would not have desisted from tempting his mind by various methods, if the occasion for using bland insinuations had not been promptly cut off.