Sahih Muslim Book - 54, Hadith - 7525

حَدَّثَنِى أَبُو خَيْثَمَةَ زُهَيْرُ بْنُ حَرْبٍ وَمُحَمَّدُ بْنُ الْمُثَنَّى - وَاللَّفْظُ لاِبْنِ الْمُثَنَّى - قَالاَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ - وَهُوَ ابْنُ مَهْدِىٍّ - حَدَّثَنَا سُفْيَانُ عَنْ قَيْسِ بْنِ مُسْلِمٍ عَنْ طَارِقِ بْنِ شِهَابٍ أَنَّ الْيَهُودَ قَالُوا لِعُمَرَ إِنَّكُمْ تَقْرَءُونَ آيَةً لَوْ أُنْزِلَتْ فِينَا لاَتَّخَذْنَا ذَلِكَ الْيَوْمَ عِيدًا. فَقَالَ عُمَرُ إِنِّى لأَعْلَمُ حَيْثُ أُنْزِلَتْ وَأَىَّ يَوْمٍ أُنْزِلَتْ وَأَيْنَ رَسُولُ اللَّهِ -صلى الله عليه وسلم- حَيْثُ أُنْزِلَتْ أُنْزِلَتْ بِعَرَفَةَ وَرَسُولُ اللَّهِ -صلى الله عليه وسلم- وَاقِفٌ بِعَرَفَةَ. قَالَ سُفْيَانُ أَشُكُّ كَانَ يَوْمَ جُمُعَةٍ أَمْ لاَ. يَعْنِى ( الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ وَأَتْمَمْتُ عَلَيْكُمْ نِعْمَتِى)

It was narrated from Tariq bin Shihab that the Jews said to 'Umar: "You recite a Verse which, if it had been revealed among us, we would have taken that day as a (day of) festival." 'Umar said: "I know where it was revealed, on what day it was revealed, and where the Messenger of Allah (s.a.w) was when it was revealed. It was revealed in 'Arafat, when the Messenger of Allah (s.a.w) was standing in 'Arafah." Sufyan said: "I am not sure whether it was a Friday or not, meaning (the Verse): ' ...This day, I have perfected your religion for you, completed My Favor upon you..."'