Sunan Ibn Majah
Establishing the Prayer and the Sunnah Regarding Them — Hadith #835
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 .
“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.”