Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) said: “Whoever claims for himself a father other than his (real) father, or claims as his mawla (patron) someone other than those who set him free, then upon him is the curse of Allah, the angels, and all people until the Day of Resurrection. None of his deeds or wealth will be accepted.”