Hebrews 7:21

He became a priest with an oath when God said to him: Jehovah has sworn and he will feel no regret, you are a priest forever. (Psalm 110:4)

Psalm 110:4

Jehovah has taken an oath and will not change his mind: You are a priest forever in the order of Melchizedek.

Hebrews 7:17

For it is announced: You are a priest forever according to the order of Melchizedek.

1 Samuel 15:29

The Glory of Israel does not lie or change his mind. He is not a mortal who changes his mind.

Hebrews 6:16-18

Men swear by someone greater then themselves: and an oath for confirmation to them puts an end to the problem.

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 announced: You are a priest forever according to the order of Melchizedek.
Psalm 110:4
Jehovah has taken an oath and will not change his mind: You are a priest forever in the order of Melchizedek.

Sware

Hebrews 6:16
Men swear by someone greater then themselves: and an oath for confirmation to them puts an end to the problem.

General references

Hebrews 7:17
For it is announced: You are a priest forever according to the order of Melchizedek.