ذِكْرُ تَعَاهُدِ الْمُصْطَفَى ﷺ عَلَى رَكْعَتَيِ الْفَجْرِ
The Messenger of Allah ﷺ was more particular about observing the supererogatory rak'ahs before the dawn prayer than about observing any of the other supererogatory prayers. (Using translation from Abū Dāʾūd 1254)
«أَنَّ رَسُولَ اللَّهِ ﷺ لَمْ يَكُنْ عَلَى شَيْءٍ مِنَ النَّوَافِلِ أَشَدَّ مُعَاهَدَةً مِنْهُ عَلَى الرَّكْعَتَيْنِ قَبْلَ الصُّبْحِ»