Hebrews 7:1-3, 17-18

For this Melchisedec, king of Salem, priest of the most high God, who met Abraham returning from the slaughter of the kings, and blessed him; to whom also Abraham gave a tenth part of all; first being by interpretation King of righteousness, and after that also King of Salem, which is, King of peace; without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the Son of God; abideth a priest continually.

For he testifieth, Thou art a priest for ever After the order of Melchisedec. For there is verily a disannulling of the commandment going before for the weakness and unprofitableness thereof.