Question: What is the ruling on observing Sawm (Fast) on the Days of Tashreeq (11th, 12th, and 13th of Thul-Hijjah) for pilgrims and non-pilgrims? The thirteenth day of Thul-Hijjah is the last day of the Days of Tashreeq and the first day of the White Days (13th, 14th, and 15th of every Hijree month). Is it permissible for someone who habitually fasts the White Days to fast the Days of Tashreeq? I hope Your Eminence would give me a written Fatwaa (legal opinion issued by a qualified Muslim scholar) which I can distribute among those who ask about this matter.
Answer: It is forbidden by Sharee`ah (Islaamic law) to observe voluntary Sawm on the Days of Tashreeq, whether or not one is a pilgrim. As for non-pilgrims, Muslim related from Nubayshah Al-Hudhaly that he said… read more here.