Hebrews 7:16-18 Living Bible (TLB)
16 did not become a priest by meeting the old requirement of belonging to the tribe of Levi, but on the basis of power flowing from a life that cannot end. 17 And the psalmist points this out when he says of Christ, “You are a priest forever with the rank of Melchizedek.”
18 Yes, the old system of priesthood based on family lines was canceled because it didn’t work. It was weak and useless for saving people.