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.
bayhaqi:9476[Chain 1] Abū al-Ḥusayn b. al-Faḍl al-Qaṭṭān > ʿAbdullāh b. Jaʿfar > Yaʿqūb b. Sufyān > Muslim b. Ibrāhīm > Abū ʿAwānah [Chain 2] Abū al-Ḥusayn b. al-Faḍl al-Qaṭṭān > Abū Sahl b. Ziyād al-Qaṭṭān > Mūsá b. Hārūn b. ʿAbdullāh > Khalaf b. Hishām > Abū ʿAwānah

[Machine] I saw Hasan al-Basri on the day of Arafah after Asr prayer, sitting and making dua and remembrance of Allah. So the people gathered around him, and in another narration by Imam Muslim, I saw Hasan leaving the enclosure on the day of Arafah after Asr prayer, and he sat down and introduced himself.  

البيهقي:٩٤٧٦أَخْبَرَنَا أَبُو الْحُسَيْنِ بْنُ الْفَضْلِ الْقَطَّانُ أنبأ عَبْدُ اللهِ بْنُ جَعْفَرٍ ثنا يَعْقُوبُ بْنُ سُفْيَانَ ثنا مُسْلِمُ بْنُ إِبْرَاهِيمَ ثنا أَبُو عَوَانَةَ ح وَأَخْبَرَنَا أَبُو الْحُسَيْنِ بْنُ الْفَضْلِ الْقَطَّانُ أنبأ أَبُو سَهْلِ بْنُ زِيَادٍ الْقَطَّانُ ثنا مُوسَى بْنُ هَارُونَ بْنِ عَبْدِ اللهِ ثنا خَلَفُ بْنُ هِشَامٍ ثنا أَبُو عَوَانَةَ قَالَ

رَأَيْتُ الْحَسَنَ الْبَصْرِيَّ يَوْمَ عَرَفَةَ بَعْدَ الْعَصْرِ جَلَسَ فَدَعَا وَذَكَرَ اللهَ ﷻ فَاجْتَمَعَ النَّاسُ وَفِي رِوَايَةِ مُسْلِمٍ رَأَيْتُ الْحَسَنَ خَرَجَ يَوْمَ عَرَفَةَ مِنَ الْمَقْصُورَةِ بَعْدَ الْعَصْرِ فَقَعَدَ فَعَرَّفَ