Charles Ellicott Commentary Hebrews 7:8

"And here men that die receive tithes; but there one, of whom it is witnessed that he liveth." — Hebrews 7:8 (ASV)

“Here,” under the Levitical economy, dying men receive the various tithes. Men enter by birth into a state with which this right is associated, and by death, they pass out of it again. Therefore, no special significance attaches to the men themselves.

“There,” in the history now considered, one (receives tithes) of whom the Scripture simply witnesses that he lives. The narrative of Genesis gives no other basis for his priesthood than the mere fact of his life. What he holds, he holds by personal right.