1 Corinthians 15:5 - Coke's Commentary on the Holy Bible

Then of the twelve.— It is certain, that neither Judas nor Thomas was there, and probably James might be absent, (see on 1 Corinthians 15:7.) But as the council of twenty-three among the Jews might be said to be assembled if the greater part were present, though the number might not be complete; so the company might be called the twelve, though we should suppose a fourth part to have been absent. See Mark 16:14.Luke 24:36. John 20:26.