[Machine] "That the Prophet ﷺ entered the mosque while the prayer was being established and a man was praying two units (rak'ahs) of voluntary prayer. The Prophet ﷺ said, 'Do you pray the morning prayer four units?'"
أَنَّ النَّبِيَّ ﷺ دَخَلَ الْمَسْجِدَ وَقَدْ أُقِيمَتِ الصَّلَاةُ وَرَجُلٌ يُصَلِّي رَكْعَتَيْنِ فَقَالَ تُصَلِّي الصُّبْحَ أَرْبَعًا