Theodoret of Cyrus: Christ Died for the Elect Alone

And just as it belongs to human beings to die once, and after that judgment, so too Christ, offered once to bear the sins of many, will appear a second time apart from sin for the salvation of those awaiting him (vv.27-28): as it is appointed for each human being to die once, and the one who accepts death's decree no longer sins but awaits the examination of what was done in life, so Christ the Lord, after being offered once for us and taking up our sins, will come to us again, with sin no longer in force, that is, with sin no longer occupying a place as far as human beings are concerned. He said himself, remember, when he still had a mortal body, "He committed no sin, nor was guile found in his mouth." It should be noted, of course, that he bore the sins of many, not of all: not all came to faith, so he removed the sins of the believers only.

- Theodoret of Cyrus (around A.D. 393 to around A.D. 457), Commentary on Hebrews, Chapter 9, in Theodoret of Cyrus, Commentary on the Letters of St. Paul, Volume 2, p. 175 (2001), Robert C. Hill translator.