Psalm 110:4

And Melchizedek king of Salem brought out bread and wine; now he was a priest of God Most High.

“Indeed, it is He who will build the temple of Yahweh, and He who will bear the splendor and sit and rule on His throne. Thus, He will be a priest on His throne, and the counsel of peace will be between the two offices.”’

The crowd then answered Him, “We have heard from the Law that the Christ is to remain forever; and how do You say, ‘The Son of Man must be lifted up’? Who is this Son of Man?”

just as He says also in another passage, “You are a priest forever According to the order of Melchizedek.”

In the same way God, desiring even more to show to the heirs of the promise the unchangeableness of His purpose, guaranteed it with an oath,

where a forerunner has entered for us—Jesus, having become a high priest forever according to the order of Melchizedek.

For it is witnessed about Him, “You are a priest forever According to the order of Melchizedek.”

(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’”);