Hebrews 7:6-7

Melchizedek the Priest (Hebrews 7:1-10 true)
The King of Righteousness (Hebrews 7:1-10 true)
The Priestly Order of Melchizedek (Hebrews 7:1-10 true)
The Greatness of Melchizedek (Hebrews 7:1-10 true)
Melchizedek Is Greater Than Abraham (Hebrews 7:1-14 true)
The Messiah is Superior to Melchizedek (Hebrews 7:1-28 true)
Melchizedek’s Priesthood Like Christ’s (Hebrews 7:1-28 true)

Greater people bless lesser people, so the fact that Melchizedek blessed Abraham shows his superiority over Abraham.