It was a requirement that an apostle see Jesus.1,2,3,7.
Jesus chose the men that would be by his side during his ministry known as “the twelve” or “the apostles”1,9. Not to be confused with other messengers we read about in Scripture5,8, it was an official office during Jesus’ ministry6,9 that continued after Jesus’ ascension2 and through the early church4 period.
When Judas, one of the original twelve was replaced, we see the qualification noted that any replacement would have had seen Jesus, specifically being a witness of Jesus raised from the dead2. Later, Paul confirms this even further, affirming in the defense of his apostleship (the office7) that he too saw the risen Jesus3 – even if it was “untimely”7.