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."
Reference: Sunan an-Nasa'i 2258 In-book : Book 22, Hadith 169 English translation : Vol. 3, Book 22, Hadith 2260
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