Hadithcore
Riyad as-Salihin, 1339

Abu Sa'id Al-Khudri (May Allah be pleased with him) reported:

The Messenger of Allah (ﷺ) said, "Every slave of Allah who observes Saum (fasting) for a day in the Cause of Allah, Allah will keep his face from Hell-fire at a distance of seventy years." <b>[Al- Bukhari and Muslim]</b>.

وعن أبي سعيد رضي الله عنه قال‏:‏ قال رسول الله صلى الله عليه وسلم ‏:‏ ‏

‏ما من عبد يصوم يومًا في سبيل الله إلا باعد الله بذلك اليوم وجهه عن النار سبعين خريفًا‏

‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏

References1 variant
In-Book Reference
Book 11, Hadith 55
Sharh · explanationclick to expand
<b>Guidance from the Hadiths:</b><br> 1) A person who fasts a day during Jihad shall attain a great reward, provided this does not undermine his physical strength and vigor in fighting.<br> 2) Performing acts of piety at times of hardship and psychological stress is a cause for multiplication of reward and distancing from Hellfire.
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