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The White Days (13th–15th of each Hijri month): fasting them

Short answerThe White Days are the 13th, 14th and 15th of each Hijri month, named for their moonlit nights. Fasting them every month is recommended; the Prophet ﷺ advised Abu Hurayra, Abu ad-Darda and others to do so.

Next date (expected)2026年10月24日星期六
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Date per the Umm al-Qura calendar, confirmed by moon sighting.

The evidence

Hadith
إِذَا صُمْتَ مِنَ الشَّهْرِ ثَلَاثَةَ أَيَّامٍ فَصُمْ ثَلَاثَ عَشْرَةَ وَأَرْبَعَ عَشْرَةَ وَخَمْسَ عَشْرَةَ

If you fast three days of the month, fast the 13th, 14th and 15th.

At-Tirmidhi 761, An-Nasa’i 2424, graded good by Al-Albani

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