Sahih Muslim 1960
صحيح مسلم#1960Sahihحَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا شُعْبَةُ، عَنِ الأَسْوَدِ، سَمِعَ جُنْدَبًا الْبَجَلِيَّ، قَالَ شَهِدْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم صَلَّى يَوْمَ أَضْحًى ثُمَّ خَطَبَ فَقَالَ " مَنْ كَانَ ذَبَحَ قَبْلَ أَنْ يُصَلِّيَ فَلْيُعِدْ مَكَانَهَا وَمَنْ لَمْ يَكُنْ ذَبَحَ فَلْيَذْبَحْ بِاسْمِ اللَّهِ " .
Jundab al-Bajali reported:I saw Allah's Messenger (ﷺ) observing ('Id) prayer on the Day of Sacrifice (10th of Dhu'l-Hijja) and then delivering a sermon and he said: He who sacrificed the (animal) before offering ('Id) prayer, he should offer again in its stead, and he who did not sacrifice the animal should slaughter it by reciting the name of Allah
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 1960 is the standard (Abd al-Baqi) number; this narration is #5067 in the MuslimGPT index.
In-book reference: 35:4