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}  

If this verse were revealed in relation to the Jews (i e. "This day I have perfected your religion for you and have completed My favours for you and have chosen for you al-Islam as religion") we would have taken the day of rejoicing on which this verse was revealed. Thereupon 'Umar said: I know the day on which it was revealed and the hour when it was revealed and where Messenger of Allah ﷺ had been when it was revealed. It was revealed on the night of Friday and we were in 'Arafat with Messenger of Allah ﷺ at that time.  

قَالَتِ الْيَهُودُ لِعُمَرَ لَوْ عَلَيْنَا مَعْشَرَ يَهُودَ نَزَلَتْ هَذِهِ الآيَةُ { الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ وَأَتْمَمْتُ عَلَيْكُمْ نِعْمَتِي وَرَضِيتُ لَكُمُ الإِسْلاَمَ دِينًا} نَعْلَمُ الْيَوْمَ الَّذِي أُنْزِلَتْ فِيهِ لاَتَّخَذْنَا ذَلِكَ الْيَوْمَ عِيدًا قَالَ فَقَالَ عُمَرُ فَقَدْ عَلِمْتُ الْيَوْمَ الَّذِي أُنْزِلَتْ فِيهِ وَالسَّاعَةَ وَأَيْنَ رَسُولُ اللَّهِ ﷺ حِينَ نَزَلَتْ نَزَلَتْ لَيْلَةَ جَمْعٍ وَنَحْنُ مَعَ رَسُولِ اللَّهِ ﷺ بِعَرَفَاتٍ  

A Jew said to ʿUmar: "If this Verse had been revealed to us, we would have taken it as a festival (Eid): 'This day, I have perfected your religion for you.'" Umar said: "I know the day when it was revealed and the night on which it was revealed: a Friday night when we were with Messenger of Allah in Arafat."  

يَهُودِيٌّ لِعُمَرَ لَوْ عَلَيْنَا نَزَلَتْ هَذِهِ الآيَةُ لاَتَّخَذْنَاهُ عِيدًا { الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ } قَالَ عُمَرُ قَدْ عَلِمْتُ الْيَوْمَ الَّذِي أُنْزِلَتْ فِيهِ وَاللَّيْلَةَ الَّتِي أُنْزِلَتْ لَيْلَةَ الْجُمُعَةِ وَنَحْنُ مَعَ رَسُولِ اللَّهِ ﷺ بِعَرَفَاتٍ  

A Jewish man came to 'Umar and said: O Ameer al-Mu'mineen, you read a verse in your Book which, if it had been revealed to us Jews, we would have taken that day as a festival. He said: Which verse is it? He said: The verse: ʿThis day, I have perfected your religion for you, completed My Favour upon you” (al Ma'idah 5:3]. 'Umar said: By Allah, I know the day on which this was revealed to the Messenger of Allah ﷺ and the hour at which it was revealed to the Messenger of Allah ﷺ, on the afternoon of 'Arafah on a Friday.  

يَا أَمِيرَ الْمُؤْمِنِينَ إِنَّكُمْ تَقْرَءُونَ آيَةً فِي كِتَابِكُمْ لَوْ عَلَيْنَا مَعْشَرَ الْيَهُودِ نَزَلَتْ لاتَّخَذْنَا ذَلِكَ الْيَوْمَ عِيدًا قَالَ وَأَيُّ آيَةٍ هِيَ؟ قَالَ قَوْلُهُ ﷻ {الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ وَأَتْمَمْتُ عَلَيْكُمْ نِعْمَتِي} [المائدة 3] قَالَ فَقَالَ عُمَرُ وَاللهِ إِنَّي لَأَعْلَمُ الْيَوْمَ الَّذِي نَزَلَتْ عَلَى رَسُولِ اللهِ ﷺ وَالسَّاعَةَ الَّتِي نَزَلَتْ فِيهَا عَلَى رَسُولِ اللهِ ﷺ عَشِيَّةَ عَرَفَةَ فِي يَوْمِ الْجُمُعَةِ  

If this verse were revealed in relation to the Jews (i e. "This day I have perfected your religion for you and have completed My favours for you and have chosen for you al-Islam as religion") we would have taken the day of rejoicing on which this verse was revealed. Thereupon 'Umar said: I know the day on which it was revealed and the hour when it was revealed and where Messenger of Allah ﷺ had been when it was revealed. It was revealed on the night of Friday and we were in 'Arafat with Messenger of Allah ﷺ at that time. (Using translation from Muslim 3017b)   

يَهُودِيٌّ لِعُمَرَ لَوْ عَلِمْنَا مَعْشَرَ الْيَهُودِ مَتَى نَزَلَتْ هَذِهِ الْآيَةُ لَاتَّخَذْنَاهُ عِيدًا {الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ} وَلَوْ نَعْلَمُ الْيَوْمَ الَّذِي نَزَلَتْ فِيهِ لَاتَّخَذْنَاهُ عِيدًا فَقَالَ عُمَرُ ؓ «قَدْ عَلِمْتُ الْيَوْمَ الَّذِي أُنْزِلَتْ فِيهِ وَاللَّيْلَةَ الَّتِي أُنْزِلَتْ يَوْمَ الْجُمُعَةِ وَنَحْنُ مَعَ رَسُولِ اللَّهِ ﷺ بِعَرَفَاتٍ»  

A Jew said to ʿUmar: "If this Verse had been revealed to us, we would have taken it as a festival (Eid): 'This day, I have perfected your religion for you.'" Umar said: "I know the day when it was revealed and the night on which it was revealed: a Friday night when we were with Messenger of Allah in Arafat." (Using translation from Nasāʾī 3002)  

قَالَ يَهُودِيٌّ لِعُمَرَ لَوْ عَلَيْنَا نَزَلَتْ هَذِهِ الْآيَةُ لَاتَّخَذْنَاهُ عِيدًا {الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ} [المائدة 3] قَالَ عُمَرُ «قَدْ عَلِمْتُ الْيَوْمَ الَّذِي أُنْزِلَتْ فِيهِ وَاللَّيْلَةَ الَّتِي نَزَلَتْ لَيْلَةُ الْجُمُعَةِ وَنَحْنُ مَعَ رَسُولِ اللهِ ﷺ بِعَرَفَاتٍ»