Sahih Muslim Book 4, Hadith 113
The Apostle of Allah (ﷺ) went to Bani Amr b. 'Auf in order to bring about reconciliation amongst them. The rest of the hadith is the same but with (the addition of these words):" The Messenger of Allah (ﷺ) came and made his way through the rows till he came to the first row and Abu Bakr retraced his steps."
" Abu Bakr lifted his hands and praised Allah and retraced his (steps) till he stood in a row."
I also moved along with him till he came to the people and (he found) that they had been saying their prayer under the Imamah of 'Abd al-Rahman b. 'Auf. The Messenger of Allah (ﷺ) could get one rak ah out of two and said (this) last rak'ah along with the people. When Abd al-Rahman b. 'Auf pronounced the salutation, the Messenger of Allah (ﷺ) got up to complete the prayer. This made the Muslims terrified and most of them began to recite the glory of the Lord. When the Messenger of Allah (ﷺ) finished his prayer, he turned towards them and then said: You did well, or said with a sense of joy: You did the right thing that you said prayer at the appointed hour.