"Hafsah told me that the Messenger of Allah ﷺ used to pray two brief rak'ahs before Fajr, and that was after dawn had broken." (Using translation from Nasāʾī 1778)
«أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يَرْكَعُ رَكْعَتَيْنِ قَبْلَ الْفَجْرِ وَذَلِكَ بَعْدَمَا يَطْلُعُ الْفَجْرُ»