Hazrat Amr bin Khariyah narrates that the Noble Prophet (peace and blessings be upon him) addressed the people while he was mounted on his riding animal, and the animal was chewing its cud and its saliva was flowing between its shoulders. The Prophet (peace and blessings be upon him) said: Whoever attributes himself to someone other than his (real) father, or whoever establishes a relationship with someone other than his master, then the curse of Allah is upon him. None of his obligatory or voluntary acts of worship will be accepted.