Sunan an Nasai
The Book of Forgetfulness (In Prayer)
Hadith #179
13.179
أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا أَبُو الأَحْوَصِ، عَنْ سِمَاكٍ، عَنْ جَابِرِ بْنِ سَمُرَةَ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا صَلَّى الْفَجْرَ قَعَدَ فِي مُصَلاَّهُ حَتَّى تَطْلُعَ الشَّمْسُ .
It was narrated that Jabir bin Samurah said:"When the Messenger of Allah (ﷺ) prayed fajr, he would sit in the place where he had prayed until the sun rose