Sunan Ibn Majah Book 5, Hadith 1101

حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ سَعْدِ بْنِ عَمَّارِ بْنِ سَعْدٍ، مُؤَذِّنِ النَّبِيِّ ـ صلى الله عليه وسلم ـ حَدَّثَنِي أَبِي عَنْ أَبِيهِ عَنْ جَدِّهِ أَنَّهُ كَانَ يُؤَذِّنُ يَوْمَ الْجُمُعَةِ عَلَى عَهْدِ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ إِذَا كَانَ الْفَىْءُ مِثْلَ الشِّرَاكِ ‏.‏

‘Abdur-Rahman bin Sa’d bin ‘Ammar bin Sad, the Mu’adh-dhin of the Prophet (ﷺ), said:“My father told me, narrating from his father, from his grandfather, that during the time of the Messenger of Allah (ﷺ), he used to call the Adhan on Fridays when the shadow was like a sandal strap.”