Hebrews 7:21

For, they, indeed, apart from oath-taking, have been made priests, but, he, with an oath-taking, through him that was saying unto him - The Lord sware, and will not regret, - Thou, art a priest, age-abidingly

Psalm 110:4

Yahweh, hath sworn - and will not repent, Thou, shalt be a priest unto times age-abiding, after the manner of Melchizedek.

Hebrews 7:17

For it is witnessed - Thou, art a priest, age-abidingly, according to the rank of Melchizedek.

1 Samuel 15:29

Moreover also, the Eminence of Israel, will not lie, neither will he repent, - For no, iron of earth, is, he, to repent!

Hebrews 6:16-18

For, men, by the greater one, swear, and, with them, an end of all gainsaying by way of confirmation is, the oath:

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 - Thou, art a priest, age-abidingly, according to the rank of Melchizedek.
Psalm 110:4
Yahweh, hath sworn - and will not repent, Thou, shalt be a priest unto times age-abiding, after the manner of Melchizedek.

Sware

Hebrews 6:16
For, men, by the greater one, swear, and, with them, an end of all gainsaying by way of confirmation is, the oath:

General references

Hebrews 7:17
For it is witnessed - Thou, art a priest, age-abidingly, according to the rank of Melchizedek.