The Book of Menstruation
وَحَدَّثَنَا مُحَمَّدُ بْنُ الصَّبَّاحِ، حَدَّثَنَا إِبْرَاهِيمُ بْنُ سَعْدٍ، حَدَّثَنَا الزُّهْرِيُّ، عَنْ جَعْفَرِ بْنِ عَمْرِو بْنِ أُمَيَّةَ الضَّمْرِيِّ، عَنْ أَبِيهِ، أَنَّهُ رَأَى رَسُولَ اللَّهِ صلى الله عليه وسلم يَحْتَزُّ مِنْ كَتِفٍ يَأْكُلُ مِنْهَا ثُمَّ صَلَّى وَلَمْ يَتَوَضَّأْ .Ja'far b. Amr b. Umayya al-Damari reported on the authority of his father who said:I saw the Messenger of Allah (ﷺ) take slices from goat's shoulder, and then eat them, and then offer prayer without having performed ablution
From Sahih Muslim, whose reports the scholars accept as authentic.