Sunan an-Nasa'i, Volume 2, Book 13, Hadith 1359 (DarusSalam) ⓘ

It was narrated that Simak bin Harb said: "I said to Jabir bin Samurah: 'Did you used to sit with the Messenger of Allah?" He said: 'Yes.' When the Messenger of Allah had prayed fajr, he would sit in the place where he had prayed until the sun rose, and his companions would talk and remember things from the time of Jahilliyah and recite poetry, and they would laugh and he would smile.'"

أَخْبَرَنَا أَحْمَدُ بْنُ سُلَيْمَانَ، قَالَ حَدَّثَنَا يَحْيَى بْنُ آدَمَ، قَالَ حَدَّثَنَا زُهَيْرٌ، وَذَكَرَ، آخَرَ عَنْ سِمَاكِ بْنِ حَرْبٍ، قَالَ قُلْتُ لِجَابِرِ بْنِ سَمُرَةَ كُنْتَ تُجَالِسُ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ نَعَمْ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا صَلَّى الْفَجْرَ جَلَسَ فِي مُصَلاَّهُ حَتَّى تَطْلُعَ الشَّمْسُ فَيَتَحَدَّثُ أَصْحَابُهُ يَذْكُرُونَ حَدِيثَ الْجَاهِلِيَّةِ وَيُنْشِدُونَ الشِّعْرَ وَيَضْحَكُونَ وَيَتَبَسَّمُ صلى الله عليه وسلم ‏.‏