Wherein. — Since this is the case.
Of promise. — Rather, of the promise. The promise made to Abraham was substantially and really (see Hebrews 6:13) that which embraced all Messianic hope; of this promise not Abraham’s sons only, but all “they which are of faith” (Galatians 3:7; Galatians 3:29), Abraham’s spiritual seed, are the heirs. In an Epistle so distinctly Pauline there can be no doubt as to this interpretation.
Confirmed it by an oath. — Literally, mediated with an oath. When a man confirms a promise or declaration to another by solemn appeal to God, between the two God is Mediator. Condescending to man’s weakness, that the certainty may be “more abundant,” God. thus confirms His word, at once the Promiser and the Mediator: God the Promiser (if we may so speak) makes appeal to God the Hearer and Witness of the oath. We cannot doubt, as we read this whole passage, that there is a special reason for the emphasis thus laid on God’s oath to Abraham. The writer dwells on this confirmation of the divine word of promise, not merely because it is the first recorded in sacred history, but because he has in thought the declaration of Psalms 110:4. To this as yet he makes no reference; though he has quoted from the verse repeatedly, it has been without mention of the divine oath: but throughout the section before us he is preparing the way for his later argument in Hebrews 7:21.