I saw the Prophet (ﷺ) eating of a shoulder (of a sheep) by cutting from it and then he was called to prayer and he prayed without repeating his ablution. Narrated Az-Zuhri:

as above (Hadith No. 173...) and added that the Prophet (ﷺ) put the knife down.

Sahih al-Bukhari Book 56, Hadith 136