What is the ruling on one who attributes himself to other than his father?

Whoever attributes himself to other than his father commits a grave sin, for the Prophet, peace and blessings be upon him, said: "Whoever claims to be the son of other than his father, knowing that he is not his father, Paradise is forbidden for him," and "Do not deny your fathers, for whoever denies his father has committed disbelief." He also said: "Whoever attributes himself to other than his father, or affiliates himself with other than his masters, upon him is the curse of Allah, the angels, and all of mankind. Allah will not accept from him on the Day of Resurrection any expiation or justice." This includes both the close and distant father.