Hebrews 7:21
but Jesus did so with a sworn affirmation by the one who said to him, "The Lord has sworn and will not change his mind, 'You are a priest forever'" --
Psalm 110:4
The Lord makes this promise on oath and will not revoke it: "You are an eternal priest after the pattern of Melchizedek."
Hebrews 7:17
For here is the testimony about him: "You are a priest forever in the order of Melchizedek."
1 Samuel 15:29
The Preeminent One of Israel does not go back on his word or change his mind, for he is not a human being who changes his mind."
Hebrews 6:16-18
For people swear by something greater than themselves, and the oath serves as a confirmation to end all dispute.