The Báb said that the Letters of the Living were special. In Shi'a Islam there are fourteen special people, called the "Infallibles". Shi'as believe the "Infallibles" are always right. Muhammad, the twelve Imáms, and Fatimah, are the "Infallibles" in Shi'a Islam. Just like the "Infallibles", one of the letters of the Living was a woman, and one was a prophet. Nineteen was a special number in Bábism. The Letters of the Living were very much like the Twelve Apostles of Christ.