How does one qualify to be an apostle? The first act of the apostles after the Ascension of Jesus was to find a replacement for Judas. With all the questions, doubts, and dangers facing them, they chose to focus their attention on finding a twelfth apostle. Why was this important? Twelve was a very important number to the Chosen People: twelve was the number of the twelve tribes of Israel. If the new Israel was to come from the disciples of Jesus, a twelfth apostle was needed. But Jesus … Excellent content provided by https://www.catholic.org/.