«ليس من رجل ادعى لغير أبيه وهو يعلمه إلا كفر ومن ادعى ما ليس له فليس منا وليتبوأ مقعده من النار ومن دعا رجلا بالكفر أو قال عدو الله وليس كذلك إلا حار عليه ولا يرمي رجل رجلا بالفسق ولا يرميه بالكفر إلا ارتدت عليه إن لم يكن صاحبه كذلك»
The Prophet (peace and blessings be upon him) said:
"Any man who knowingly attributes himself to someone other than his father has committed disbelief. Whoever claims what is not his is not one of us, and let him take his seat in the Fire. Whoever calls a man a disbeliever or says 'enemy of Allah' while he is not so, it will come back upon himself. And let no man accuse another of sinfulness or of disbelief, for if his companion is not so, the accusation will rebound upon himself."
Hadith Referenceصحیح الجامع الصغیر / حرف اللام / 5431