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; abides a priest continually.
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George Leo Haydock

AD 1849
Without father Not that he had no father 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 that 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.)

John Chrysostom

AD 407
He then adds another distinction, Without father, without mother, without genealogy, having neither beginning of days nor end of life, but made like the Son of God, abides a Priest continually. Since then there lay in his way [as an objection] the [words] You are a Priest for ever, after the order of Melchisedec, whereas he [Melchisedec] was dead, and was not Priest for ever, see how he explained it mystically. 'And who can say this concerning a man?' I do not assert this in fact (he says); the meaning is, we do not know when [or] what father he had, nor what mother, nor when he received his beginning, nor when he died. And what of this (one says)? For does it follow, because we do not know it, that he did not die, [or] had no parents? You say well: he both died and had parents. How then [was he] without father, without mother? How having neither beginning of days nor end of life? How? [Why] from its not being expressed. And what of this? That as this man is so, from his genealogy n...

Lucius Caecilius Firmianus Lactantius

AD 320
Nevertheless it was His pleasure that He should be born as a man, that in all things He might be like His supreme Father; For God the Father Himself, who is the origin and source of all things, inasmuch as He is without parents, is most truly named by Trismegistus "fatherless "and "motherless"

Thomas Aquinas

AD 1274
326. – In Chapter 5 the Apostle proved that Christ is a priest, but in Chapter 6 he interposed certain considerations to prepare the minds of his hearers. Now he returns to his main theme: for he intends to prove the excellence of Christ’s priesthood over the Levitical priesthood. In regard to this he does two things: first, he shows the excellence of Christ’s priesthood as compared to the priesthood of the Old Testament; secondly, he shows that believers should subject themselves reverently to the priesthood of Christ (c. 10). In regard to the first he does two things: first, he shows the prerogative of Christ’s priesthood over the Levitical on the part of the person of the priest; secondly, on the part of the minister (c. 8). In regard to the first he does two things: first, he proves the existence of Christ’s priesthood by reason of a divine promise; secondly, the need for this priesthood (v. 26). But he shows this promise from the words of Ps. 109 (v. 4): ‘The Lord has sworn and he...

Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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