Sahih al-Bukhari 6767
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا خَالِدٌ ـ هُوَ ابْنُ عَبْدِ اللَّهِ ـ حَدَّثَنَا خَالِدٌ، عَنْ أَبِي عُثْمَانَ، عَنْ سَعْدٍ ـ رضى الله عنه...
Narrated Sa`d:I heard the Prophet (ﷺ) saying, "Whoever claims to be the son of a person other than his father, and he knows that person is not his father, then...