The Jews said to Umar, "You recite a verse which, had it been revealed to us, we would have taken its day as a festival."Umar replied, "I know exactly when it was revealed, where it was revealed, and where the Messenger of Allah ﷺ was when it was revealed. It was revealed on the Day of Arafah, and by Allah, we were at Arafah."Sufyan said, "I am uncertain whether it was a Friday or not." The verse is, "This day I have perfected for you your religion" [Maidah 5:3].
حدثني محمد بن بشار حدثنا عبد الرحمن حدثنا سفيان عن قيس
اليهود لعمر إنكم تقرءون آية لو نزلت فينا لاتخذناها عيدا فقال عمر إني لأعلم حيث أنزلت وأين أنزلت وأين رسول الله ﷺ حين أنزلت يوم عرفة وإنا والله بعرفة قال سفيان وأشك كان يوم الجمعة أم لا {اليوم أكملت لكم دينكم}