Mishkat al-Masabih #1973
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ عَامِرِ بْنِ مَسْعُودٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «الْغَنِيمَةُ الْبَارِدَةُ الشِّتَاءِ» . رَوَاهُ أَحْمَدُ وَالتِّرْمِذِيُّ وَقَالَ: هَذَا حَدِيثٌ مُرْسل
‘Amir b. Mas'ud reported God’s messenger as saying, “Fasting in winter is booty gained without trouble.”*
*Literally, 'the cold booty.' The idea is that in winter one does not suffer from hunger and thirst as in summer.
Ahmad and Tirmidhi transmitted it, the latter saying this is a mursal tradition.
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About Mishkat al-Masabih
This hadith is #1973 from Mishkat al-Masabih, in the Book of Fasting.