Fasting was a way to deal with sin in the church. When someone had caused an offence in the church that person was put on a fast between 2 to 7 weeks, depending on the offense. They understood that fasting afflicts the soul to refrain from sin. Fasting is one of the most effective ways to get rid of sin. When they completed their fast, they inspected them to see if the sin was dealt with, if they truly had repented, they were allowed back into the body.
An exorcist is not ordained. It’s not an office and nor are you ordained because of it. Exorcism, or deliverance, is done through the gift of healing by the process of revelation.
The spiritual gifts weren’t given until you were ordained. You’re either ordained a presbyter, deacon or bishop. The Apostle/Bishop is the only one in the church who can impart the gifts of the Holy Spirit in the church.
This is the list of many Bishops that were ordained by the Apostles. This was the beginning of the apostolic succession, the beginning of the next line of Apostles.