1 Corinthians 15:5 - Joseph Benson’s Commentary on the Old and New Testaments

And that he was seen of Cephas As mentioned Luke 24:34, who saw him before any of the other apostles. He appeared, indeed, after his resurrection, first of all to Mary Magdalene: but as no woman was employed to testify his resurrection to the world, St. Paul did not think it necessary, in exhibiting the proofs of Christ's resurrection, to mention any of his appearances to the women. Then of the twelve That company of apostles so called, though several of the number were not present when he appeared. Macknight thinks, that in this expression all our Lord's appearances to his apostles, from the time he arose, to the time he showed himself to the five hundred brethren at once, are comprehended; namely, his appearance to the apostles on the evening of the day on which he arose, and on the eighth day thereafter, and at the sea of Tiberias, as also every other appearance to them which the evangelists may have omitted to relate; for that they omitted some is certain.