Prayer (Kitab Al-Salat)
2/15. Chapter:
Whoever Sleeps Through The Prayer (Time) Or Forgets (To Pray)
Sunan Abi Dawud
حَدَّثَنَا مُؤَمَّلُ بْنُ الْفَضْلِ، حَدَّثَنَا الْوَلِيدُ، عَنْ حَرِيزٍ، - يَعْنِي ابْنَ عُثْمَانَ - عَنْ يَزِيدَ بْنِ صَالِحٍ، عَنْ ذِي، مِخْبَرِ بْنِ أَخِي النَّجَاشِيِّ فِي هَذَا الْخَبَرِ قَالَ فَأَذَّنَ وَهُوَ غَيْرُ عَجِلٍ .
This tradition has also been transmitted through another chain of narrators by Dhu Mikhbar, the nephew of the Negus. This version adds: "He (Bilal) called for prayer unhurriedly."
Reference : Sunan Abi Dawud 446In-book reference : Book 2, Hadith 56English translation : Book 2, Hadith 446