According to Clement of Alexandria, teachings of Matthias were used by Basilideans and perhaps other Gnostic groups. According to Hippolytus, Basilides and his son Isidore claimed to have learned from Matthias "secret words", which he had received in private teaching from the Saviour. A disciple called Mathias replaced Judas Iscariot in apostolic succession after the crucifixion of Jesus.