Messenger of Allah ﷺ passed by a man praying two rakʿat after the Iqama (had been pronounced). When Messenger of Allah ﷺ completed the prayer, the people gathered around him (the Prophet) or that man and Messenger of Allah ﷺ said to him (protesting), Are there four rakʿat in Fajr prayer? Are there four rakʿat in Fajr prayer?"  

أَنَّ رَسُولَ اللَّهِ ﷺ رَأَى رَجُلاً وَقَدْ أُقِيمَتِ الصَّلاَةُ يُصَلِّي رَكْعَتَيْنِ فَلَمَّا انْصَرَفَ رَسُولُ اللَّهِ ﷺ لاَثَ بِهِ النَّاسُ وَقَالَ لَهُ رَسُولُ اللَّهِ ﷺ: «الصُّبْحَ أَرْبَعًا؟ الصُّبْحَ أَرْبَعًا؟»