[من أعان ظالما ليدحض بباطله حقا فقد برئت منه ذمة الله وذمة رسوله]
The Prophet (peace and blessings be upon him) said:
"Whoever helps a wrongdoer so that he may wipe out a truth by means of his falsehood, the protection of Allah and of His Messenger is withdrawn from him."
Hadith Referenceصحیح الجامع الصغیر / حرف الميم / 6048M