Hebrews 7:3

Without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the Son of God; abideth a priest continually.

Without father, without mother, without pedigree — Recorded, without any account of his descent from any ancestors of the priestly order.

Having neither beginning of days, nor end of life — Mentioned by Moses.

But being — In all these respects.

Made like the Son of God — Who is really without father, as to his human nature; without mother, as to his divine; and in this also, without pedigree - Neither descended from any ancestors of the priestly order.

Remaineth a priest continually — Nothing is recorded of the death or successor of Melchisedec. But Christ alone does really remain without death, and without successor.