There was some quarrel among the members of Banu 'Amr bin 'Auf. Messenger of Allah (ﷺ) went with some of his Companions to bring about peace between them and he was detained. The time for Salat approached and Bilal (May Allah be pleased with them) went to Abu Bakr (May Allah be pleased with him) and said to him: "Messenger of Allah (ﷺ) has got late and it is the time for Salat. Will you lead Salat?" He said: "Yes, if you desire". Bilal (May Allah be pleased with him) proclaimed the Adhan and then pronounced Iqamah. Abu Bakr (May Allah be pleased with him) stepped forward and commenced As- Salat. (He recited Takbir and the people followed him). In the meantime, Messenger of Allah (ﷺ) arrived and, passing through the rows, took his stand in the first row. The people started clapping. It was the habit of Abu Bakr (May Allah be pleased with him) that whenever he started praying, he would never look round. He paid no heed (to the clapping). When the clapping increased, he turned round and saw Messenger of Allah (ﷺ). He (the Prophet (ﷺ)) beckoned him to continue performing Salat. But Abu Bakr (May Allah be pleased with him) raised his hands and praised Allah. Then he retreated, taking his steps backwards. When Messenger of Allah (ﷺ) saw that, he went ahead and led Salat. When he finished Salat, he faced the congregation and said, "Why do you clap when something happens during the Salat. Clapping is only for women. If something happens in the course of Salat you should say, Subhan Allah. It is bound to attract attention. And you, Abu Bakr, what prevented you from carrying on with Salat, after I beckoned to do so?" He said, "It was not becoming for the son of Abu Quhafah to lead Salat in the presence of Messenger of Allah (ﷺ)".

[Al-Bukhari and Muslim].