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.

Treasury of Scripture Knowledge

Summary

(For those priests were made without an oath; but this with an oath by him that said unto him, The Lord sware and will not repent, Thou art a priest for ever after the order of Melchisedec:)

Sware

General references

Bible References

The lord

Hebrews 7:17
for it is witnessed of him, Thou art a priest for ever After the order of Melchizedek.
Psalm 110:4
Jehovah hath sworn, and will not repent: Thou art a priest for ever After the order of Melchizedek.

Sware

Hebrews 6:16
For men swear by the greater: and in every dispute of theirs the oath is final for confirmation.

General references

Hebrews 7:17
for it is witnessed of him, Thou art a priest for ever After the order of Melchizedek.

American Standard Version Public Domain