Jami` at-Tirmidhi 1684
جامع الترمذي#1684SahihNarrated Abu Sa’id Al Khudri : "During the year of the conquest, when the Prophet (ﷺ) reached Marr Zahran, he told us that we would meet the enemy. So he ordered us to break the fast, and we [all] broke our fast." [Abu 'Eisa said:] This Hadith is Hasan Sahih, and there is something on this topic from Ibn 'Umar
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih Muslim
In-book reference: 23:15