Murdock(i)
13 For when God made the promise to Abraham, because there was none greater than himself by whom he could swear, he swore by himself;
14 and said: Blessing, I will bless thee, and multiplying I will multiply thee.
15 And so he was patient, and obtained the promise.
16 For men swear by one greater than themselves: and in every controversy that occurs among them, the sure termination of it is by an oath.
17 Therefore, God, being abundantly willing to show to the heirs of the promise, that his promising was irreversible, bound it up in an oath;
18 so that, by two things which change not, and in which God cannot lie, we, who have sought refuge in him, might have great consolation, and might hold fast the hope promised to us;