Tirmidhi Book 47, Hadith 3043

حَدَّثَنَا ابْنُ أَبِي عُمَرَ، حَدَّثَنَا سُفْيَانُ، عَنْ مِسْعَرٍ وَغَيْرِهِ، ‏‏‏‏‏‏عَنْ قَيْسِ بْنِ مُسْلِمٍ، عَنْ طَارِقِ بْنِ شِهَابٍ، قَالَ:‏‏‏‏ قَالَ رَجُلٌ مِنْ الْيَهُودِ لِعُمَرَ بْنِ الْخَطَّابِ:‏‏‏‏ يَا أَمِيرَ الْمُؤْمِنِينَ، ‏‏‏‏‏‏لَوْ عَلَيْنَا أُنْزِلَتْ هَذِهِ الْآيَةَ الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ وَأَتْمَمْتُ عَلَيْكُمْ نِعْمَتِي وَرَضِيتُ لَكُمُ الإِسْلامَ دِينًا سورة المائدة آية 3 لَاتَّخَذْنَا ذَلِكَ الْيَوْمَ عِيدًا، ‏‏‏‏‏‏فَقَالَ لَهُ عُمَرُ بْنُ الْخَطَّابِ:‏‏‏‏ أَنِّي أَعْلَمُ أَيَّ يَوْمٍ أُنْزِلَتْ هَذِهِ الْآيَةُ أُنْزِلَتْ يَوْمَ عَرَفَةَ فِي يَوْمِ الْجُمُعَةِ ، ‏‏‏‏‏‏قَالَ أَبُو عِيسَى:‏‏‏‏ هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ.

Narrated Tariq bin Shihab: A man among the Jews said to 'Umar bin Al-Khattab: 'O Commander of the Believers! If we were the ones unto whom this Ayah was revealed, 'This day, I have perfected your religion for you, completed My favor upon you, and have chosen for you Islam as your religion (5:3).' - then we would have taken that day as a day of celebration.' So 'Umar bin Al-Khattab said to him: 'Indeed I do know which day this Ayah was revealed upon. It was revealed on the Day of 'Arafah, on Friday.'