Jami' al-Tirmidhi The Book on Fasting Abdullah bin Abi Najih عبد الله بن أبي نجيح Abu Najih أبو نجيح والد عبد الله بن أبي نجي Ahmed bin Manay' أحمد بن منيع Ali bin Hujr bin Iyas bin Maqatil علي بن حجر بن إياس بن مقاتل Sufyan bin 'Uyaynah سفيان بن عيينة “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.” https://parallelquran.com/hadith/jami-al-tirmidhi-751/