Mishkat al-Masabih #1961
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ صَامَ يَوْمًا فِي سَبِيلِ اللَّهِ بَعَّدَ اللَّهُ وَجْهَهُ عَنِ النَّارِ سَبْعِينَ خَرِيفًا»
Abu Sa‘id al-Khudri reported God’s messenger as saying, “If anyone fasts for a day while engaged in jihad, God will remove him* seventy years’ distance from hell.”
*Literally, ‘his face’.
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #1961 from Mishkat al-Masabih, in the Book of Fasting.