Musnad Ahmad 272
It was narrated from Tariq bin Shihab that:
The Jews said to `Umar. You recite a verse which, is it had been revealed among us, we would have taken that day as a festiva!. ʻUmar said: I know where it was revealed, on what day it was revealed and where the Messenger of Allah (ﷺ) was when it was revealed. It was revealed on the day of `Arafah, when the Messenger of Allah (ﷺ) was standing in `Arafah, Sufyan said: I am not sure whether it was a Friday or not, i.e., `This day, I have perfected your religion for you, completed My Favour upon you, and have chosen for you Islam as your religion.” (al-Ma’idah 5:3).
حَدَّثَنَا عَبْدُ الرَّحْمَنِ، حَدَّثَنَا سُفْيَانُ، عَنْ قَيْسِ بْنِ مُسْلِمٍ، عَنْ طَارِقِ بْنِ شِهَابٍ، أَنَّ الْيَهُودَ، قَالُوا لِعُمَرَ إِنَّكُمْ تَقْرَءُونَ آيَةً لَوْ أُنْزِلَتْ فِينَا لَاتَّخَذْنَا ذَلِكَ الْيَوْمَ عِيدًا فَقَالَ إِنِّي لَأَعْلَمُ حَيْثُ أُنْزِلَتْ وَأَيَّ يَوْمٍ أُنْزِلَتْ وَأَيْنَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ حِينَ أُنْزِلَتْ أُنْزِلَتْ يَوْمَ عَرَفَةَ وَرَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَاقِفٌ بِعَرَفَةَ قَالَ سُفْيَانُ وَأَشُكُّ يَوْمَ جُمُعَةٍ أَوْ لَا يَعْنِي الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ وَأَتْمَمْتُ عَلَيْكُمْ نِعْمَتِي وَرَضِيتُ لَكُمْ الْإِسْلَامَ دِينًا‏.‏