Theophylact of Bulgaria
“And that He appeared to Cephas.”
He first sets forth the most trustworthy witness of all. Although the Gospel says that the Lord first appeared to Mary (Mk 16:9), among men He appeared first to Peter, as the best of the disciples.
For the one who first confessed Him as Christ ought to be the first to see the Resurrection. He appears to him before the others also because of his denial, to show him that he was not rejected.
“Then to the twelve,” τοις δώδεκα.
Matthias was numbered in place of Judas after the Lord’s Ascension. How then does Paul say, “then to the twelve”?
We answer: He probably appeared to Matthias after the Ascension, as He also appeared to Paul, who was called after the Ascension. Therefore Paul did not specify the time, but spoke indefinitely.
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Some say that here there is a scribal error. Or, the Lord, foreknowing and foreseeing that Matthias would be numbered with the eleven, also appeared to him, so that in this respect too he would not be inferior to the other apostles.
John expresses something similar when he says, “Thomas, one of the twelve” (Jn 20:24).
For anyone would more readily say that He numbered Matthias among the other apostles according to foreknowledge, than Judas after his betrayal and suicide.