(2) باب رَكْعَتَىِ الْفَجْرِ
Narrated 'Aishah:
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. (RU)
Reference (RU): Sunan Abi Dawud 1254 (RU)
In-book reference (RU): Book 5, Hadith 5 (RU)
English translation (RU): Book 5, Hadith 1249 (RU)