Melchisedec
( See Scofield) - (Genesis 14:18).
Melchisedec was a suitable type of Christ as High Priest, because:
(1) he was a king-priest (Genesis 14:18); (Zechariah 6:12); (Zechariah 6:13).
(2) his name means, "my king is righteous" (compare (Isaiah 11:5) and he was king of Salem (that is, "peace". (compare (Isaiah 11:6-9).)
(3) he had no (recorded) "beginning of days" (compare (John 1:1) nor "end of life" (compare (Romans 6:9); (Hebrews 7:23-25); nor
(4) was he made a high priest by human appointment (Psalms 110:4).
But the contrast between the high priesthood of Melchisedec and Aaron is only as to person, "order" (or appointment), and duration.
In His work, Christ follows the Aaronic pattern, the "shadow" of which Christ was the substance. (Hebrews 8:1-6); (Hebrews 9:1-28).