“The Messenger of Allah (ﷺ) set out to bring about reconciliation among Banu ‘Amr bin ‘Awf. The time for prayer came, and the Mu’adhdhin went to Abu Bakr to tell him to gather the people and lead them in prayer. Then the Messenger of Allah (ﷺ) came and passed though the rows until he stood in the first row. The people started clapping to let Abu Bakr know that the Messenger of Allah (ﷺ) had come. Abu Bakr never used to turn around when he prayed, but when they clapped consistently he realized something must have happened while they were praying. So he turned around and saw the Messenger of Allah (ﷺ). The Messenger of Allah (ﷺ) gestured to him to stay where he was. Abu Bakr raised his hands and praised and thanked Allah (SWT) for what the Messenger of Allah (ﷺ) had said. Then, he moved backwards, and the Messenger of Allah (ﷺ) went forward and prayed. When he finished, he said to Abu Bakr: ‘What stopped you from continuing to pray when I gestured to you?’ Abu Bakr, may Allah (SWT) be pleased with him, said: ‘It was not appropriate for the son of Abu Quhafah to lead the Messenger of Allah (ﷺ) in prayer.’ Then he said to the people: ‘Why did you clap?’ Clapping is for women.’ Then he said: ‘If you notice something when you are praying, say “SubhanAllah.'”
That the Messenger of Allah (ﷺ) used to say the taslim to his right and to his left.
The Prophet (ﷺ) used to say salam to his right and to his left: As-salamu ‘alaykum wa rahmatullah, as-salamu alaykum wa rahmatullah (peace be upon you and the mercy of Allah, peace be upon you and the mercy of Allah) until the whiteness of his cheek could be seen from here, and the whiteness of his cheek from here.
The tradition mentioned above has also been transmitted by Umm Salamah from the Prophet (ﷺ) through a different chain of narrators. The tradition of Mu’adh is more perfect.