direct
points forward to · a priest forever
A thousand years after Genesis 14, David sings of a figure who is both at God's right hand and a priest after the order of Melchizedek — reopening a single, brief encounter as prophecy.
direct
points forward to · no beginning, no end
Hebrews reads the silence of Genesis — no genealogy, no death recorded — as a portrait of a priesthood that does not pass on with a family line, and applies it to Christ.
direct
points forward to · the greater blesses the lesser
Abraham gives Melchizedek a tenth and receives his blessing. Hebrews makes much of the direction of that exchange: Levi, still in Abraham, paid tithes too.
indirect
points forward to · bread and wine
The priest-king of Salem brings out bread and wine to bless Abram — the earliest appearance in Scripture of the two elements Jesus takes up on the last night.