"Nor shall you spare (him)"Deuteronomy 13:9.

In the course of the court proceedings, the person who is the target of incitement to idol worship is not allowed to justify the actions of the one who urged him to abandon G‑d, nor is he allowed to express anything positive about the inciter that could possibly lead to his vindication. (This is an exception to the general rule. Normally, the courts encourage anyone who has anything positive to say about the accused to speak up.)