Ayesha reported,

The Prophet ﷺ was not more diligent in observing any voluntary prayer than he was with the two rakahs before Fajr.

Azami 13411

Sahih

عن عائشة قالت

لم يكن النبي ﷺ على شيء من النوافل أشد منه تعاهدا على ركعتي الفجر.

الأعظمي 13411صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Tafsir of the great Quran
Chapter
Tafsir of Surah Tur
Section
His saying, "Or were they created by nothing, or were they the creators? Or did they create the heavens and the earth? Rather, they are not certain. Or have they the treasuries of your Lord? Or are they the controllers?"
Numbering
Jami al-Kamil 13411 (2nd edition)
Azami 13411