Hadith 33

Bulugh al-Maram

Book 2: The Book of Prayer
Hadith 33
وَزَادَ أَحْمَدُ فِي آخِرِهِ قِصَّةَ قَوْلِ بِلَالٍ فِي آذَانِ اَلْفَجْرِ: { اَلصَّلَاةُ خَيْرٌ مِنَ اَلنَّوْمِ } 1‏ .‏
Ahmad added to the end of the above Hadith, the story of BIlal's statement in the Fajr Adhan (morning prayer call):

as-Salatu khairun minan-nawm - "Prayer is better than sleep".