"Bilal used to call the Adhan when the Messenger of Allah ﷺ sat on the Minbar on Friday, and when he came down he would say the Iqamah. It continued like that during the time of Abu Bakr and 'Umar, may Allah (SWT) be pleased with them."
كَانَ بِلاَلٌ يُؤَذِّنُ إِذَا جَلَسَ رَسُولُ اللَّهِ ﷺ عَلَى الْمِنْبَرِ يَوْمَ الْجُمُعَةِ فَإِذَا نَزَلَ أَقَامَ ثُمَّ كَانَ كَذَلِكَ فِي زَمَنِ أَبِي بَكْرٍ وَعُمَرَ ؓ
[Machine] The Messenger of Allah ﷺ had only one Mu'adhin for all prayers, whether on Friday or other days. He would give the Adhan and Iqamah. It is narrated that Bilal would give the Adhan when the Messenger of Allah ﷺ sat on the pulpit on Fridays, and would give the Iqamah when he came down. This practice continued during the caliphate of Abu Bakr and Umar, until the time of Uthman.
لَمْ يَكُنْ لِرَسُولِ اللهِ ﷺ إِلَّا مُؤَذِّنٌ وَاحِدٌ فِي الصَّلَوَاتِ كُلِّهَا فِي الْجُمُعَةِ وَغَيْرِهَا يُؤَذِّنُ وَيُقِيمُ قَالَ كَانَ بِلَالٌ يُؤَذِّنُ إِذَا جَلَسَ رَسُولُ اللهِ ﷺ عَلَى الْمِنْبَرِ يَوْمَ الْجُمُعَةِ وَيُقِيمُ إِذَا نَزَلَ وَلِأَبِي بَكْرٍ وَعُمَرَ حَتَّى كَانَ عُثْمَانُ
"Bilal used to call the Adhan when the Messenger of Allah ﷺ sat on the Minbar on Friday, and when he came down he would say the Iqamah. It continued like that during the time of Abu Bakr and 'Umar, may Allah (SWT) be pleased with them." (Using translation from Nasāʾī 1394)
«كَانَ بِلَالٌ يُؤَذِّنُ إِذَا جَلَسَ رَسُولُ اللهِ ﷺ عَلَى الْمِنْبَرِ يَوْمَ الْجُمُعَةِ فَإِذَا نَزَلَ أَقَامَ ثُمَّ كَانَ كَذَلِكَ فِي زَمَنِ أَبِي بَكْرٍ وَعُمَرَ»