عَنْ بِلَالٍ رَضِيَ اللَّهُ عَنْهُ قَالَ: أَمَرَنِي رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَنْ لَا أُثَوِّبَ فِي شَيْءٍ مِنَ الصَّلَاةِ إِلَّا فِي صَلَاةِ الْفَجْرِ، وَقَالَ أَبُو أَحْمَدَ (أَحَدُ الرُّوَاةِ) فِي حَدِيثِهِ: قَالَ لِي رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((إِذَا أَذَّنْتَ فَلَا تُثَوِّبْ))
Sayyiduna Bilal (may Allah be pleased with him) says: The Messenger of Allah (peace and blessings be upon him) commanded me that I should not say "As-Salatu Khayrun Minan-Nawm" (Prayer is better than sleep) in any prayer except the Fajr prayer. And one narrator of the hadith, Abu Ahmad, says that Sayyiduna Bilal (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) said to me: When you give the adhan, do not say "As-Salatu Khayrun Minan-Nawm."