From Sahih Bukhari (Hadith 5455):
Narrated Suwaid:We went out with Allah's Messenger (ﷺ) to Khaibar. and when we reached As-Sahba', which (Yahya says) is one day' journey from Khaibar, the Prophet (ﷺ) asked for food, and he was offered nothing but Sawiq which we chewed and ate. Then the Prophet (ﷺ) asked for water and rinsed his mouth, and we too, rinsed our mouths along with him. He then led us in the Maghrib prayer without performing ablution again
Reference: Bukhari 5455