Hebrews 7:21

but this one was made a priest with an oath by the one who said to him : The Lord has sworn and will not change his mind , You are a priest forever .

but he became a priest with an oath when God said to him: “The Lord has sworn and will not change his mind: ‘You are a priest forever.`”

( 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 :)