"The Messenger of Allah ﷺ led us in Zuhr prayer and Abu Bakr was behind him. When the Messenger of Allah ﷺ said the Takbir, Abu Bakr said the Takbir so that the people could hear." (Using translation from Nasāʾī 798)
«صَلَّى بِنَا رَسُولُ اللهِ ﷺ الظُّهْرَ وَأَبُو بَكْرٍ خَلْفَهُ فَإِذَا كَبَّرَ رَسُولُ اللهِ ﷺ كَبَّرَ أَبُو بَكْرٍ يُسْمِعُنَا»