Here, finally, the Apostle sets before us the fourth superior feature of Melchizedek, specifically as a type of Christ. This is his independence from time and his abiding dignity, not only in his own days, with Abraham, but also in all later and distant times.
To depict this feature, according to the Apostle's earlier observation, Melchizedek is presented in Scripture as though without father, without mother, without genealogy, having neither beginning of days nor end of life (Heb 7:3 above).
Here the Apostle again unfolds this feature of Melchizedek's transcendence of time in connection with the tithe he received, and in particular in application to Abraham's descendant Levi and his priesthood.
The Apostle's reasoning is as follows. Since Melchizedek is a priest who remains forever (Heb 7:3 above), and has testimony about himself that he lives (Heb 7:8 above), then at the very time when he received the tithe from Abraham, he received it as though from all Abraham's future descendants.
And so to speak, Levi himself, who receives tithes, paid tithes in the person of Abraham. For he was still in the loins of his father when Melchizedek met him (Heb 7:9-10).
Thus in this historical circumstance, seemingly simple and accidental, the God-inspired gaze of the Apostle Paul was shown the deliberate intention of the Lord God. He intended to prefigure the Levitical priests as tributaries of Melchizedek for all subsequent times.