Hebrews 7:21
(for they indeed have been made priests without an oath; but he with an oath by him that saith of him, The Lord sware and will not repent himself, Thou art a priest for ever);
Psalm 110:4
Jehovah hath sworn, and will not repent: Thou art a priest for ever After the order of Melchizedek.
Hebrews 7:17
for it is witnessed of him, Thou art a priest for ever After the order of Melchizedek.
1 Samuel 15:29
And also the Strength of Israel will not lie nor repent; for he is not a man, that he should repent.
Hebrews 6:16-18
For men swear by the greater: and in every dispute of theirs the oath is final for confirmation.