Baptism is a required ordinance and ritual cleansing process when joining the LDS Church, and is considered to be a purification process in one's conversion. In the event of one's excommunication or adoption of another faith, individuals are required to be rebaptized when returning to the church. Baptism is also seen as symbolic of the death and resurrection of Jesus Christ with the water representing the grave. After the one being baptized is determined to be worthy through an interview with their priesthood leader, he is dressed in white clothing, symbolizing the purification of the baptism. The ordinance is performed by a priest of the Aaronic priesthood or any holder of the Melchizedek priesthood. Mormon children are not baptized until they turn eight years old, which is considered to be the age of accountability.