Hebrews 7:20-22
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20Inasmuch as it is not without the taking of an oath, 21for they indeed have been made priests without an oath; but he with an oath by him that says of him, "The Lord swore and will not change his mind, `You are a priest forever, According to the order of Melchizedek`".
22By so much has Jesus become the collateral of a better covenant.
Hebrews 7:20-22 (WEB)