'Abdur-Rahman bin Sa'd bin 'Ammar bin Sad, the Mu'adh-dhin oftheProphet (ﷺ), said:
"My father told me, narrating from hisfather,from his grandfather, that during the time of the Messengerof Allah(ﷺ), he used to call the Adhan on Fridays when the shadowwas like asandal strap."
English reference: Vol. 1, Book 5, Hadith 1101
Arabic reference: Book 5, Hadith 1155