Deuteronomy 13:6-11 -

A second case supposed is that of temptation to apostasy proceeding from some near relative or intimate friend. Not only was this to be resisted, but no consideration of affection or bend of friendship was to be allowed to interfere with the stern sentence which doomed the tempter to death; on the contrary, the person tempted was to be the first to lay hands on the tempter and put him to death. This was to be done by stoning, and the person he had tried to seduce was to cast the first stone.