just as He also says in another place,

“You are a priest [appointed] forever
According to the order of Melchizedek.”

For it is attested [by God] of Him,

“You (Christ) are a Priest forever
According to the order of Melchizedek.”

(for those Levites who formerly became priests [received their office] without [its being confirmed by the taking of] an oath, but this One [was designated] with an oath through the One who said to Him,

“The Lord has sworn
And will not change His mind or regret it,
‘You (Christ) are a Priest forever’”).

For if that first covenant had been faultless, there would have been no occasion for a second one or an attempt to institute another one [the new covenant].