New American Standard Bible
(for they indeed became priests without an oath, but He with an oath through the One who said to Him, "THE LORD HAS SWORN AND WILL NOT CHANGE HIS MIND, 'YOU ARE A PRIEST FOREVER '");

King James Bible
(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:)

Holman Christian Standard Bible
but He became a priest with an oath made by the One who said to Him: The Lord has sworn, and He will not change His mind, You are a priest forever.

International Standard Version
but Jesus became a priest with an oath when God told him, "The Lord has taken an oath and will not change his mind. You are a priest forever."

NET Bible
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'"--

Aramaic Bible in Plain English
For they were Priests without an oath, but this one, with an oath, as he said to him by David: “THE LORD JEHOVAH has sworn and will not lie, that you are The Priest for eternity in the image of Melchizedek.”Hebrews 7:21 NIV
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