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.
nasai-kubra:2839ʿAlī b. Ḥujr > Sufyān And ʾIsmāʿīl > Ibn Abū Najīḥ from his father > Ibn ʿUmar Suʾil > Ṣawm Yawm ʿArafah

[Machine] I performed Hajj with the Prophet Muhammad ﷺ , but he did not fast it.  

الكبرى للنسائي:٢٨٣٩أَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ قَالَ أَخْبَرَنَا سُفْيَانُ وَإِسْمَاعِيلُ عَنِ ابْنِ أَبِي نَجِيحٍ عَنْ أَبِيهِ عَنِ ابْنِ عُمَرَ سُئِلَ عَنْ صَوْمِ يَوْمِ عَرَفَةَ فَقَالَ

حَجَجْتُ مَعَ النَّبِيِّ ﷺ «فَلَمْ يَصُمْهُ»