وَعَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا
قَالَتْ: لَمْ يَكُنِ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَلَى شَيْءٍ مِنَ النَّوَافِلِ أَشَدَّ تَعَاهُدًا مِنْهُ على رَكْعَتي الْفجْر
Aishah said that the Prophet (sallallahu alayhi wa sallam) was more particular about observing the two supererogatory rakas at dawn than about observing any of the other supererogatory prayers.
Mishkat al-Masabih 1102, Book 5, Prayer, Hadith 580. 1 min read