John 16:2: They shall put you out of the synagogues: yea, the time cometh, that whosoever killeth you will think that he doeth God service.
The ultimate punishment that was to be meted out by the Christian and by the Church was excommunication and separation from the fellowship of the Church. In this way, the ‘heretic’ was given over to the righteous judgment of God.
Historically, the major means that the church had of combating heretics was to excommunicate them. In the 12th and 13th centuries, however, the Inquisition was established by the church to combat heresy; heretics who refused to recant after being tried by the church were handed over to the civil authorities for punishment, usually execution.
Copyright © 1994-2000 Encyclopædia Britannica, Inc., Heresy
For the source of this quote and some history of the Inquisitions, see here:
In addition, here is a link to the movie “Inquisition” from Berean Beacon: