The version of Musa has the addition: He returned and made a call: Lo! the servant of Allah had slept.
Abu Dawud said: This tradition has been narrated by al-Darawardi from 'Ubaid Allah on the authority of Ibn 'Umar saying: There was a mu'adhdhin of 'Umar, named Mas'ud. He then narrated the rest of the tradition. This version is more correct than that one.
In-book : Book 2, Hadith 142
English translation : Book 2, Hadith 532