Narrated ['Aishah (RA)]:

The Prophet (ﷺ) was more particular about offering the two (optional) Rak'at at dawn than he was about offering any of the other optional prayers. [Agreed upon].

وَعَنْهَا قَالَتْ : { لَمْ يَكُنْ اَلنَّبِيُّ ‏- صلى الله عليه وسلم ‏-عَلَى شَيْءٍ مِنْ اَلنَّوَافِلِ أَشَدَّ تَعَاهُدًا مِنْهُ عَلَى رَكْعَتَيْ اَلْفَجْرِ } مُتَّفَقٌ عَلَيْهِ .‏ [1]‏