إِنَّ الأَذَانَ يَوْمَ الْجُمُعَةِ كَانَ أَوَّلُهُ حِينَ يَجْلِسُ الإِمَامُ يَوْمَ الْجُمُعَةِ عَلَى الْمِنْبَرِ فِي عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم وَأَبِي بَكْرٍ وَعُمَرَ ـ رضى الله عنهما ـ فَلَمَّا كَانَ فِي خِلاَفَةِ عُثْمَانَ ـ رضى الله عنه ـ وَكَثُرُوا، أَمَرَ عُثْمَانُ يَوْمَ الْجُمُعَةِ بِالأَذَانِ الثَّالِثِ، فَأُذِّنَ بِهِ عَلَى الزَّوْرَاءِ، فَثَبَتَ الأَمْرُ عَلَى ذَلِكَ.
I heard As-Saib bin Yazid, saying, "In the lifetime of Allah's Messenger (ﷺ), and Abu Bakr and `Umar, theAdhan for the Jumua prayer used to be pronounced after the Imam had taken his seat on the pulpit.But when the people increased in number during the caliphate of `Uthman, he introduced a thirdAdhan (on Friday for the Jumua prayer) and it was pronounced at Az-Zaura' and that new state ofaffairs remained so in the succeeding years.