Hebrews 7:20–21

And it was not without an oath. For those who formerly became priests were made such without an oath, 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.’ ”

And it was not without an oath! Others became priests without any oath, 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.’ ”

None of this happened without an oath. For others became priests without an oath, but he became a priest with an oath made by the one who said to him:

The Lord has sworn

and will not change his mind,

“You are a priest forever.”

This new system was established with a solemn oath. Aaron’s descendants became priests without such an oath, but there was an oath regarding Jesus. For God said to him,

“The Lord has taken an oath and will not break his vow:

‘You are a priest forever.’ ”

And by as much as this was not without an oath (for these on the one hand have become priests without an oath, but he 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’ ”),

And inasmuch as not without an oath he was made priest: (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:)