https://en.wikipedia.org/wiki/Priesthood_of_Melchizedek
Melchizedek is a king and priest appearing in the Book of Genesis. The name means "King of Righteousness" - a name echoing kingly and priestly functions. He is the first individual to be given the title Kohen (priest) in the Hebrew Bible.
>Kohen or cohen (or kohein; Hebrew: כֹּהֵן kohen, "priest", pl. כֹּהֲנִים kohanim, "priests") is the Hebrew word for "priest"
https://en.wikipedia.org/wiki/Kohen