Sunan an-Nasa'i 2258
سنن النسائي#2258SahihJabir bin 'Abdullah narrated that:the Messenger of Allah passed by a man in the shade of a tree on whom water was being sprinkled. He said: "What is the matter with your companion?" They said: "O Messenger of Allah, he is fasting." He said: "It is not righteousness to fast when traveling. Take to the concession which Allah has granted you, accept it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 22:169