The Jews said to ʿUmar, "You (i.e. Muslims) recite a Verse, and had it been revealed to us, we would have taken the day of its revelation as a day of celebration." ʿUmar said, "I know very well when and where it was revealed, and where Messenger of Allah ﷺ was when it was revealed. (It was revealed on) the day of ʿArafat (Hajj Day), and by Allah, I was at ʿArafat" Sufyan, a sub-narrator said: I am in doubt whether the Verse:-- "This day I have perfected your religion for you." was revealed on a Friday or not.
قَالَتِ الْيَهُودُ لِعُمَرَ إِنَّكُمْ تَقْرَءُونَ آيَةً لَوْ نَزَلَتْ فِينَا لاَتَّخَذْنَاهَا عِيدًا فَقَالَ عُمَرُ إِنِّي لأَعْلَمُ حَيْثُ أُنْزِلَتْ وَأَيْنَ أُنْزِلَتْ وَأَيْنَ رَسُولُ اللَّهِ ﷺ حِينَ أُنْزِلَتْ يَوْمَ عَرَفَةَ وَإِنَّا وَاللَّهِ بِعَرَفَةَ قَالَ سُفْيَانُ وَأَشُكُّ كَانَ يَوْمَ الْجُمُعَةِ أَمْ لاَ – {الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ}