Hebrews 7:17

For it is declared of him, "You are a priest forever, after the order of Melchizedek."

Hebrews 5:6

as he says also in another place, "You are a priest forever, after the order of Melchizedek."

Hebrews 7:21

Those who formerly became priests took their office without an oath, but he became a priest 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.'"

Hebrews 6:20

where Jesus has entered as a forerunner on our behalf, having become a high priest forever according to the order of Melchizedek.

Hebrews 5:10

being designated by God as a high priest according to the order of Melchizedek.

Hebrews 7:15

This becomes even more evident if another priest arises in the likeness of Melchizedek,

Treasury of Scripture Knowledge

Summary

For he testifieth, Thou art a priest for ever after the order of Melchisedec.

Bible References

General references

Hebrews 7:15
This becomes even more evident if another priest arises in the likeness of Melchizedek,
Hebrews 5:6
as he says also in another place, "You are a priest forever, after the order of Melchizedek."
Hebrews 6:20
where Jesus has entered as a forerunner on our behalf, having become a high priest forever according to the order of Melchizedek.