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It was narrated that Al-Hurr bin Sayyah said:

"I heard Ibn 'Umar say" "The Prophet used to fast three days of each month.
أَخْبَرَنَا يُوسُفُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا حَجَّاجٌ، عَنْ شَرِيكٍ، عَنِ الْحُرِّ بْنِ صَيَّاحٍ، قَالَ سَمِعْتُ ابْنَ عُمَرَ، يَقُولُ كَانَ النَّبِيُّ صلى الله عليه وسلم يَصُومُ ثَلاَثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ ‏.‏

Classification

Sahih (Authentic)

References

• Sunan an-Nasa'i, 2413
• Sunan an-Nasa'i, Vol. 3, Book of Fasting, Hadith 2415
• Sunan an-Nasa'i, Book of Fasting, Hadith 2415