When it was dawn, the Messenger of Allah (ﷺ) observed two rak'ahs, and I would say: Does he recite only the opening chapter of the Qur'an in it?
Sahih Muslim Book 6, Hadith 115
← Previous Hadith Did he recite in them Surah Fatiha (only)?

Sahih Muslim Book 6, Hadith 114 Next Hadith → 'A'isha reported that the Apostle (ﷺ) was not so much particular about observing supererogatory rak'ahs as in case of the two rak'ahs of the dawn prayer.

Sahih Muslim Book 6, Hadith 116