Language:
كتاب الأذان
10  
Call to Prayers (Adhaan)
(43)
Chapter: When the Imam is called for As-Salat (the prayer) while he has in his hands something to eat.
(43)
باب إِذَا دُعِيَ الإِمَامُ إِلَى الصَّلاَةِ وَبِيَدِهِ مَا يَأْكُلُ
Sahih al-Bukhari 675

Narrated Ja`far bin `Amr bin Umaiya:

My father said, "I saw Allah's Messenger (ﷺ) eating a piece of meat from the shoulder of a sheep and he was called for the prayer. He stood up, put down the knife and prayed but did not perform ablution.''

حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ عَبْدِ اللَّهِ، قَالَ حَدَّثَنَا إِبْرَاهِيمُ، عَنْ صَالِحٍ، عَنِ ابْنِ شِهَابٍ، قَالَ أَخْبَرَنِي جَعْفَرُ بْنُ عَمْرِو بْنِ أُمَيَّةَ، أَنَّ أَبَاهُ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَأْكُلُ ذِرَاعًا يَحْتَزُّ مِنْهَا، فَدُعِيَ إِلَى الصَّلاَةِ فَقَامَ فَطَرَحَ السِّكِّينَ، فَصَلَّى وَلَمْ يَتَوَضَّأْ‏.‏
Reference : Sahih al-Bukhari 675
In-book reference : Book 10, Hadith 69
USC-MSA web (English) reference : Vol. 1, Book 11, Hadith 643
  (deprecated numbering scheme)