Hebrews 7:3

Without father, &c. Not that he had no father, &c. but that neither his father, nor his pedigree, nor his birth, nor his death, are set down in Scripture. (Challoner) --- Not that he was without father and mother, says St. Jerome, (ep. cxxxvi.) for Christ himself was not without a Father according to his divinity, nor without a Mother in his humanity; but because his genealogy is not given in Genesis, as of the other patriarchs is, but he is abruptly introduced without any mention of either his birth or death. In Melchisedech all was prophetical and figurative of Jesus Christ; and Abraham undoubtedly in this patriarch saw Jesus Christ in spirit, and exulted that all the nations of the earth were to be blessed in him. Abraham, your father, greatly desired, says our Lord to the Jews, to see the day of my coming: he saw it, and was filled with joy. (John viii. 56.)