Hebrews 7:21
Good News Translation
But Jesus became a priest by means of a vow when God said to him, "The Lord has made a solemn promise and will not take it back: 'You will be a priest forever.'"

New Revised Standard Version
but this one became a priest with an oath, because of the one who said to him, “The Lord has sworn and will not change his mind, ‘You are a priest forever’”—

New American Bible
but he with an oath, through the one who said to him: “The Lord has sworn, and he will not repent: ‘You are a priest forever’ ”—

Douay-Rheims Bible
But this with an oath, by him that said unto him: The Lord hath sworn and he will not repent: Thou art a priest for ever).

Treasury of Scripture Knowledge

But this with an oath, by him that said unto him: The Lord hath sworn and he will not repent: Thou art a priest for ever).

an oath.

Hebrews 7:17 For he testifieth: Thou art a priest for ever according to the order of Melchisedech.

Psalm 110:4 The Lord hath sworn, and he will not repent: Thou art a priest for ever according to the order of Melchisedech.

sware.

Hebrews 6:16-18 For men swear by one greater than themselves: and an oath for confirmation is the end of all their controversy. . . .

Context
A Superior Priesthood
20And inasmuch as it is not without an oath (for the others indeed were made priests without an oath: 21But this with an oath, by him that said unto him: The Lord hath sworn and he will not repent: Thou art a priest for ever). 22By so much is Jesus made a surety of a better testament.…
Cross References
Numbers 23:19
God is not a man, that he should lie, nor is the son of man, that he should be changed. Hath he said then, and will he not do? hath he spoken, and will he not fulfil?

1 Samuel 15:29
But the triumpher in Israel will not spare, and will not be moved to repentance: for he is not a man that he should repent.

Psalm 110:4
The Lord hath sworn, and he will not repent: Thou art a priest for ever according to the order of Melchisedech.

Romans 11:29
For the gifts and the calling of God are without repentance.

Hebrews 5:6
As he saith also in another place: Thou art a priest for ever, according to the order of Melchisedech.

Hebrews 7:17
For he testifieth: Thou art a priest for ever according to the order of Melchisedech.

Hebrews 7:20
And inasmuch as it is not without an oath (for the others indeed were made priests without an oath:

Hebrews 7:23
And the others indeed were made many priests, because by reason of death they were not suffered to continue:

Hebrews 7:28
For the law maketh men priests, who have infirmity: but the word of the oath (which was since the law) the Son who is perfected for evermore.

Hebrews 7:20
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