For when God made promise to Abraham - That he would bless him, and multiply his seed as the stars of heaven; Genesis 22:16-17. The object of introducing this example here is, to encourage those to whom the apostle was writing to persevere in the Christian life, This he does by showing that God had given the highest possible assurance of his purpose to bless his people, by an oath. Reference is made to Abraham in this argument, probably, for two reasons:

(1) To show the nature of the evidence which Christians have that they will be saved, or the ground of encouragement - being the same as that made to Abraham, and depending, as in his case, on the promise of God; and,

(2) because the "example" of Abraham was just in point. He had persevered. He had relied firmly and solely on the promise of God. He did this when appearances were much against the fulfillment of the promise, and he thus showed the advantage of perseverance and fidelity in the cause of God.

Because he could swear by no greater - There is no being greater than God. In taking an oath among people it is always implied that the appeal is to one of superior power, who is able to punish for its infraction. But this could not occur in the case of God himself. There was no greater being than himself, and the oath, therefore, was by his own existence.

He sware by himself - Genesis 22:16. "By myself have I sworn;" compare Isaiah 45:23. In an oath of this kind God pledges his veracity; declares that the event shall be as certain as his existence; and secures it by all the perfections of his nature. The usual form of the oath is, "As I live, saith the Lord;" see Numbers 14:21, Numbers 14:28; Ezekiel 33:11.

When God made promise to Abraham - The promise referred to is that made to Abraham when he had offered his son Isaac on the altar, Genesis 22:16-18 : "By myself have I sworn, saith the Lord; for because thou hast done this thing, and hast not withheld thy son, thy only son; that in blessing I will bless thee, and in multiplying I will multiply thy seed as the stars of the heaven, and as the sand which is upon the seashore; and thy seed shall possess the gate of his enemies; and in thy seed shall all the nations of the earth be blessed." Of this promise the apostle only quotes a part, as is generally the case, because he knew that his readers were well acquainted with the Scriptures of the Old Testament, and particularly with the law.

He sware by himself - He pledged his eternal power and Godhead for the fulfillment of the promise; there was no being superior to himself to whom he could make appeal, or by whom he could be bound, therefore he appeals to and pledges his immutable truth and Godhead.

For when God made promise to Abraham,.... The apostle proposes Abraham as a pattern, because he was the father of these Hebrews, and of all believers; and because they were interested in the promise made to him, and had a right to the same blessing with him; and because he was remarkable for his faith and patience: the promise made to him is not that in Genesis 12:1 nor that in Genesis 15:1 but that in Genesis 22:16 for that only had an oath annexed to it: and this was made by Jesus Christ, there called the Angel of the Lord, and here God; and who is truly and properly so; and than whom there is none greater; and who elsewhere, as here, is said to swear by himself, Isaiah 45:23 as follows:

because he could swear by no greater, he sware by himself; swearing is ascribed to a divine person after the manner of men, and in condescension to them; and who is never introduced swearing, but in matters of moment and of great importance; the note of Philo the Jew (n) on the passage in Genesis 22:16 from whence the following words are cited, is worthy of observation, being very near the apostle's words;

"well does he (God) confirm the promise with an oath, and with an oath that becomes God; for you see that God does not swear by another, for nothing is better than himself, but by himself, who is the best of all; but some have suggested as if it was inconvenient to swear, for an oath is taken for the sake of faith; but God alone is faithful, &c.''

(n) Leg. Allegor. l. 2. p. 98.

Illustration of the long-suffering of faith by the example of Abraham. The necessity for emphasizing this element of faith lay in the growing discouragement of the Jewish Christians at the long delay of Christ's second coming. Comp. ch. 11. Abraham became a sojourner in the land of the promise, looking for the heavenly city (Hebrews 11:9, Hebrews 11:10). All the instances cited in that chapter illustrate the long outlook of faith, involving patient waiting and endurance. The example of Abraham shows, first, that the promise of God is sure.

Because he could swear by no greater (ἐπεὶ κατ' οὐδενὸς εἶχεν μείζονος ὀμόσαι)

Lit. since he had (the power) to swear by no one greater.

By himself (καθ' ἑαυτοῦ)

Comp. Genesis 22:16. N.T.o , but see lxx, Amos 6:8.

{7} For when God made promise to Abraham, because he could swear by no greater, he sware by himself,

(7) Another encouragement, to push them onward because the hope of the inheritance is certain, if we continue to the end, for God has not only promised it, but also promised it with an oath.

6:13 For when God made promise to Abraham. The promises are absolutely sure. See how God confirmed his promise to Abraham! See Ge 22:15-18.

6:13 For - Ye have abundant encouragement, seeing no stronger promise could be made than that great promise which God made to Abraham, and in him to us.

13. For-confirming the reasonableness of resting on "the promises" as infallibly sure, resting as they do on God's oath, by the instance of Abraham. "He now gives consolation, by the oath of God's grace, to those whom, in the second, third, and fourth chapters, he had warned by the oath of God's 'wrath.' The oath of wrath did not primarily extend its force beyond the wilderness; but the oath of grace is in force for ever" [Bengel].

6:11-20 The hope here meant, is a sure looking for good things promised, through those promises, with love, desire, and valuing of them. Hope has its degrees, as faith also. The promise of blessedness God has made to believers, is from God's eternal purpose, settled between the eternal Father, Son, and Spirit. These promises of God may safely be depended upon; for here we have two things which cannot change, the counsel and the oath of God, in which it is not possible for God to lie; it would be contrary to his nature as well as to his will. And as He cannot lie; the destruction of the unbeliever, and the salvation of the believer, are alike certain. Here observe, those to whom God has given full security of happiness, have a title to the promises by inheritance. The consolations of God are strong enough to support his people under their heaviest trials. Here is a refuge for all sinners who flee to the mercy of God, through the redemption of Christ, according to the covenant of grace, laying aside all other confidences. We are in this world as a ship at sea, tossed up and down, and in danger of being cast away. We need an anchor to keep us sure and steady. Gospel hope is our anchor in the storms of this world. It is sure and stedfast, or it could not keep us so. The free grace of God, the merits and mediation of Christ, and the powerful influences of his Spirit, are the grounds of this hope, and so it is a stedfast hope. Christ is the object and ground of the believer's hope. Let us therefore set our affections on things above, and wait patiently for his appearance, when we shall certainly appear with him in glory.