"Ibn Umar was asked about fasting (the Day of) Arafah (at Arafat). He said: 'I performed Hajj with the Prophet, and he did not fast it, and with Abu Bakr, and he did not fast it, and with Umar, and he did not fast it, and with Uthman, and he did not fast it. I do no fast it, nor order it nor forbid it."
Reference: Jami` at-Tirmidhi 751 In-book : Book 8, Hadith 70 English translation : Vol. 2, Book 3, Hadith 751
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