Question 90: People here differed regarding observing Sawm (Fast) on the Day of `Arafah (9th of Dul-Hijjah) this year as it coincides with Saturday. Some said they observed Sawm on the Day of `Arafah because it was the Day of `Arafah not because it was Saturday on which observance of Sawm is prohibited. Others did not observe Sawm because it was Saturday, the Jewish day of worship, and they wanted to act in contradiction to the Jews. As for myself, I was of the latter opinion. I am confused as to what the Shar`ee (Islaamic legal) ruling is on this issue. I researched it in many religious and Sharee`ah books; however, I did not reach a decisive ruling on observing Sawm on such a day. I hope that Your Honor will guide me to the Shar`ee ruling and send it me in a written document. May Allaah reward you for this in this life and the Hereafter and for the beneficial knowledge you give to all Muslims.
Answer: Observing Sawm on the Day of `Arafah on its own, whether it coincides with Saturday or otherwise, is permissible… read more here.