From Sahih Bukhari (Hadith 5454):
Narrated Suwaid bin An Nu`man:We went out with Allah's Messenger (ﷺ) to Khaibar, and when we reached As-Sahba', the Prophet (ﷺ) asked for food, and he was offered nothing but Sawiq. We ate, and then Allah's Messenger (ﷺ) stood up for the prayer. He rinsed his mouth with water, and we too, rinsed our mouths
Reference: Bukhari 5454