"When the Prophet prayed Fajr he would remain seated where he had prayed until the sun had risen."  

كَانَ النَّبِيُّ ﷺ إِذَا صَلَّى الْفَجْرَ قَعَدَ فِي مُصَلاَّهُ حَتَّى تَطْلُعَ الشَّمْسُ  

the Messenger of Allah said: "Whoever prays Fajr in congregation, then sits remembering Allah until the sun has risen, then he prays two Rak'ah, then for him is the reward like that of a Hajj and Umrah." He said: "The Messenger of Allah said: 'Complete, complete, complete.'"  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ صَلَّى الْغَدَاةَ فِي جَمَاعَةٍ ثُمَّ قَعَدَ يَذْكُرُ اللَّهَ حَتَّى تَطْلُعَ الشَّمْسُ ثُمَّ صَلَّى رَكْعَتَيْنِ كَانَتْ لَهُ كَأَجْرِ حَجَّةٍ وَعُمْرَةٍ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ تَامَّةٍ تَامَّةٍ تَامَّةٍ