Mishkat al-Masabih #1930
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ جَابِرٍ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي سَفَرٍ فَرَأَى زِحَامًا وَرَجُلًا قَدْ ظُلِّلَ عَلَيْهِ فَقَالَ: «مَا هَذَا؟» قَالُوا: صَائِمٌ. فَقَالَ: «لَيْسَ مِنَ الْبِرِّ الصَّوْمُ فِي السَّفَرِ»
Jabir said that in the course of a journey God’s messenger saw a crowd and a man who had been put in the shade. On asking the reason and being told that he was fasting he said, “Fasting while on a journey is not a part of righteousness.”
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #1930 from Mishkat al-Masabih, in the Book of Fasting.