Jabir b. 'Abdullah (Allah be pleased with both of them) reported that in the course of a journey Allah's Messenger (ﷺ) saw a man, people crowding around him and providing him a shade. Upon this he (the Holy Prophet) said:
What is the matter with him? They said: He is a person observing fast. Whereupon the Messenger of Allah (ﷺ) said: It is no righteousness that you fast on journey.
Reference: Sahih Muslim 1115 a In-book : Book 13, Hadith 118 USC-MSA web (English) : Book 6, Hadith 2474 (deprecated)
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