عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: لَمْ يَكُنْ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ لِشَيْءٍ مِنَ النَّوَافِلِ أَشَدَّ مُعَاهَدَةً مِنَ الرَّكْعَتَيْنِ قَبْلَ الصُّبْحِ
Sayyidah Aisha (may Allah be pleased with her) says that the Messenger of Allah (peace and blessings be upon him) did not adhere to any voluntary prayer as regularly as he did to the two rak'ahs before the Fajr prayer.