Amr bin Kharijah Ash'ari (may Allah be pleased with him) narrates that I heard the Messenger of Allah (peace and blessings be upon him) say during the Farewell Pilgrimage: "Allah has given every rightful person his due right, therefore, it is not permissible to make a bequest in favor of an heir. The child belongs to the (owner of the) bed, and for the adulterer is the stone. Whoever attributes himself to someone other than his father, or affiliates himself to other than his own clients, upon him is the curse of Allah, the angels, and all people, and neither any voluntary nor obligatory act will be accepted from him."