Theodoret of Cyrus: Christ Priest and Victim in One

He has no need day after day, like the highpriests, to offer up sacrifices first for their own sin, then for the people's: he did it once and for all by offering up himself (v.27). He mentioned two things which those granted the priesthood did not have: they made the sacred offerings unceasingly, and sacrificed for themselves, being also in their own persons sinners in being human; people subject to sin do not enjoy such confidence in making offerings. He, on the other hand, does neither - the one because he has no part in sin, and the other because the one sacrifice is adequate for salvation. While they offered other sacrifices, he offered his own body, being priest and victim in his own person, and as God receiving the gift along with the Father and the Spirit.

- Theodoret of Cyrus (around A.D. 393 to around A.D. 457), Commentary on Hebrews, Chapter 7, in Theodoret of Cyrus, Commentary on the Letters of St. Paul, Volume 2, p. 168 (2001), Robert C. Hill translator.