Bukhari :: Book 3 :: Volume 31 :: Hadith 167
Narrated Jabir bin 'Abdullah:
Allah's Apostle was on a journey and saw a crowd of people, and a man was being shaded (by them). He asked, "What is the matter?" They said, "He (the man) is fasting." The Prophet said, "It is not righteousness that you fast on a journey."
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