Sahih Muslim 63
صحيح مسلم#63Sahihحَدَّثَنِي عَمْرٌو النَّاقِدُ، حَدَّثَنَا هُشَيْمُ بْنُ بَشِيرٍ، أَخْبَرَنَا خَالِدٌ، عَنْ أَبِي عُثْمَانَ، قَالَ لَمَّا ادُّعِيَ زِيَادٌ لَقِيتُ أَبَا بَكْرَةَ فَقُلْتُ لَهُ مَا هَذَا الَّذِي صَنَعْتُمْ إِنِّي سَمِعْتُ سَعْدَ بْنَ أَبِي وَقَّاصٍ يَقُولُ سَمِعَ أُذُنَاىَ مِنْ رَسُولِ اللَّهِ صلى الله عليه وسلم وَهُوَ يَقُولُ " مَنِ ادَّعَى أَبًا فِي الإِسْلاَمِ غَيْرَ أَبِيهِ يَعْلَمُ أَنَّهُ غَيْرُ أَبِيهِ فَالْجَنَّةُ عَلَيْهِ حَرَامٌ " . فَقَالَ أَبُو بَكْرَةَ وَأَنَا سَمِعْتُهُ مِنْ رَسُولِ اللَّهِ صلى الله عليه وسلم .
It is reported on the authority of Sa'd b. Abi Waqqas:Both of my ears heard the Messenger of Allah saying this: He who claimed the fatherhood of anyone else besides his real father knowingly (committed a great sin) ;Paradise is forbidden to him. Abu Bakra asserted that he too heard it from the Messenger of Allah (may peace be upon him)
Scholarly Authentication
The label above is the grade most of these scholars gave, each scholar counted once — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. When they judged only its chain of narrators (“Isnaad”), the label says “Sound chain”. Each scholar's own wording:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
Sahih Muslim 63 is the standard (Abd al-Baqi) number; this narration is #219 in the MuslimGPT index.
In-book reference: 1:125