It was narrated that "Asim al-Ahwal said: I heard Abu ‘Uthman say: I heard Sa"d - who was the first one to shoot an arrow for the sake of Allah - and Abu Bakrah - who climbed the wall of the fortress of al-Ta"if with other people then came to the Prophet (ﷺ) - say:

We heard the Prophet (ﷺ) say: “Whoever claims to belong to a father other than his father, knowing that he is not his father, Paradise will be forbidden to him."