(25) The Book on Food
كتاب الأطعمة عن رسول الله صلى الله عليه وسلم
(33) Chapter: What Has Been Related From The Prophet (saws) Permitting One To Cut Meat With A Knife
(33) باب مَا جَاءَ عَنِ النَّبِيِّ صلى الله عليه وسلم مِنَ الرُّخْصَةِ فِي قَطْعِ اللَّحْمِ بِالسِّكِّينِ
Jami` at-Tirmidhi 1836 
Narrated Ja'far bin 'Amr bin Umayyah Ad-Damri:

From his father who said that he saw the Prophet (ﷺ) making incisions (with a knife) into a piece of a lamb shoulder which he ate from, then he went to perform Salat without performing Wudu'.

[Abu 'Eisa said:] This Hadith is Hasan Sahih and there is something on this topic from Al-Mughirah bin Shu'bah.

حَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، عَنْ جَعْفَرِ بْنِ عَمْرِو بْنِ أُمَيَّةَ الضَّمْرِيِّ، عَنْ أَبِيهِ، أَنَّهُ رَأَى النَّبِيَّ صلى الله عليه وسلم احْتَزَّ مِنْ كَتِفِ شَاةٍ فَأَكَلَ مِنْهَا ثُمَّ مَضَى إِلَى الصَّلاَةِ وَلَمْ يَتَوَضَّأْ ‏.‏ قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ ‏.‏ وَفِي الْبَابِ عَنِ الْمُغِيرَةِ بْنِ شُعْبَةَ ‏.‏
Grade :  Sahih (Darussalam)
Reference : Jami` at-Tirmidhi 1836
In-book reference : Book 25, Hadith 52
English translation : Vol. 3, Book 23, Hadith 1836