Hebrews 7:1-5

For this Melchizedek, king of Salem, priest of the Most High God, who met Abraham as he was returning from the slaughter of the kings and blessed him,

to whom also Abraham apportioned a tenth of all the spoils, was first of all, by the translation of his name, king of righteousness, and then also king of Salem, which is king of peace.

Without father, without mother, without genealogy, having neither beginning of days nor end of life, but made like the Son of God, he remains a priest perpetually.

Now observe how great this man was to whom Abraham, the patriarch, gave a tenth of the choicest spoils.

And those indeed of the sons of Levi who receive the priest’s office have a commandment in the Law to collect a tenth from the people, that is, from their countrymen, although they are descended from Abraham.