And having been perfected, He became the author of eternal salvation to all who obey Him, called by God as High Priest "according to the order of Melchizedek." Hebrews 5:9-10
When Jesus died and rose again, He became our High Priest. But notice that Jesus' priesthood is "according to the order of Melchizedek".
Why the Melchizedek priesthood?
The Melchizedek priesthood gives to man (whereas the Aaronic priesthood takes from man). We see this when Melchizedek gave bread and wine to refresh a tired Abraham after his battle with the enemy kings. (Genesis 14:14-20) So if Jesus' priesthood is according to the Melchizedek order, then it is one in which we can come ………