Ephrem the Syrian : "The law appointed" weak "men as high priests" who certainly needed to offer sacrifices for their sins. "The word of the oath," however, "which" was provided in David "later than the law, appointed the Son" who remains "perfect forever." — COMMENTARY ON THE EPISTLE TO THE HEBREWS John Chrysostom : "But the word of the oath which was since the Law maketh the Son who has been consecrated for evermore." "Consecrated": what is that? Paul does not set down the common terms of contradistinction; for after saying "having Infirmity," he did not say "the Son" who is mighty, but "consecrated": i.e. mighty, as one might say. Thou seest that the name Son is used in contradistinction to that of servant. And by "infirmity" he means either sin or death. What is, "for evermore"? Not now only without sin but always. If then He is perfect, if He never sins, if He lives always, why shall He offer many sacrifices for us? But for the present he does not insist strongly on this point: but what he does strongly insist upon is, His not offering on His own behalf. — Homily on Hebrews 13 Oecumenius : "For the law appoints men."And for whose sake did he not need, he says, to offer a sacrifice for himself? Nor did he often offer for the people, as the high priests do, but having offered once, he was sufficient; why? Because the priests who are appointed from the law are under sin. Therefore, they must always offer a sacrifice for both themselves and the people. But God, by the oath made after the law, appointing the high priest Christ, who is the Son, established him as a perfect priest, and not subject to the same weakness and sin as those according to the law, once as the Son of God and God, "has been made perfect forever." In common. He established him as a priest, he says, for made perfect forever, that is, not only now being without sin, but also to be such for all time. If then he is both Son and perfect forever, for whose sake was he to need many sacrifices? — The Pseudo-Oecumenian Catena on Hebrews