Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
tirmidhi:3043Ibn Abū ʿUmar > Sufyān > Misʿar And Ghayrih > Qays b. Muslim > Ṭāriq b. Shihāb > a man from al-Yahūd Liʿumar b. al-Khaṭṭāb Yā Amīr al-Muʾminīn Law ʿAlaynā Unzilat Hadhih al-Āyah al-Yawm Akmalt Lakum Dīnakum Waʾatmamt ʿAlaykum Niʿmatī Waraḍīt Lakum al-Islām Dīn Lāttakhadhnā Dhalik al-Yawm ʿĪd

"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.'"  

Abū ʿĪsá said that this Ḥadīth is Ḥasan-Ṣaḥīḥ.
الترمذي:٣٠٤٣حَدَّثَنَا ابْنُ أَبِي عُمَرَ حَدَّثَنَا سُفْيَانُ عَنْ مِسْعَرٍ وَغَيْرِهِ عَنْ قَيْسِ بْنِ مُسْلِمٍ عَنْ طَارِقِ بْنِ شِهَابٍ قَالَ قَالَ رَجُلٌ مِنَ الْيَهُودِ لِعُمَرَ بْنِ الْخَطَّابِ يَا أَمِيرَ الْمُؤْمِنِينَ لَوْ عَلَيْنَا أُنْزِلَتْ هَذِهِ الآيَةُ ( الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ وَأَتْمَمْتُ عَلَيْكُمْ نِعْمَتِي وَرَضِيتُ لَكُمُ الإِسْلاَمَ دِينًا ) لاَتَّخَذْنَا ذَلِكَ الْيَوْمَ عِيدًا فَقَالَ لَهُ عُمَرُ بْنُ الْخَطَّابِ إِنِّي أَعْلَمُ أَىَّ يَوْمٍ أُنْزِلَتْ هَذِهِ الآيَةُ أُنْزِلَتْ يَوْمَ عَرَفَةَ فِي يَوْمِ جُمُعَةٍ
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قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ