It is narrated from Sayyiduna Abu Dharr (may Allah be pleased with him) that he heard the Prophet (peace and blessings of Allah be upon him) say: "Whoever knowingly claims to be the son of someone other than his father has committed disbelief, and whoever claims to belong to a people to whom he does not belong, he should take his place in Hell. And whoever calls someone a disbeliever or says 'enemy of Allah' to someone who is not so, this will return upon the one who said it."