Abdullah bin Mubarak عبد الله بن المبارك · The Book of Leading the Prayer (Al-Imamah)

"In the last prayer that the Messenger of Allah(ﷺ) prayed with the people, he prayed wrapped up in a single garment, behind Abu Bakr."

"There was some fighting among Banu 'Amr bin 'Awf, and news of that reached the Prophet (ﷺ). He prayed Zuhr, then he went to them to reconcile between them. Then he said to Bilal: 'O Bilal, if the time for Asr comes and I have not come back, then tell Abu Bakr to lead the people in prayer.' When the time (for Asr) came, Bilal called the Adhan, then the Iqamah, then he said to Abu Bakr: 'Go forward. So…

"The Imam is appointed to be followed. When he bows, then bow, when he stands up, then stand up, when he prostrates, then prostrate, and when he says Sami' Alldhu liman hamidah (Allah hears the one who praises Him), then say, Rabbanri lakal-hamd (Our Lord, to You be the praise)."

"The Messenger of Allah (ﷺ) and Abu Bakr passed by me and Abu Bakr said to me: '0 Mas'ud, go to Abu Tamim' - meaning the man from whom he had been freed - 'and tell him to give us a camel so that we could ride, and let him send us some food and a guide to show us the way.' So I went to my former master and told him the same, and he sent with me a…

"The Messenger of Allah (ﷺ) said: 'The best rows for men are the front rows and the worst are the last, and the best rows for women are the back rows and the worst are those in the front."'

"When any one of you leads the people in prayer, let him make it short, for among them are the sick, the weak and the elderly. And when any one of you prays by himself, let him make it as long as he wishes."

"The Messenger of Allah (ﷺ)said: 'If there are three people, let one of them lead the others in prayer, and the one who has the most right to lead the prayer is the one who recites (knows) the most (Qur'an)."'

"The Messenger of Allah (ﷺ) turned to face us when he stood up to pray, before he said Takbir, and said: 'Make your rows straight and fill the gaps, for I can see you from behind my back."'

"Abu Ad-Darda said to me: 'Where do you live?' I said: 'In a town near Hims.' Abu Ad-Darda said: 'I heard the Messenger of Allah (ﷺ) say: "There are no three people in a town or encampment among whom prayer is not established, but the Shaitan takes control of them. Therefore, stick to the congregation, for the wolf eats the sheep that strays off on its own." (One of the narrators (As Sa'ib) said: "The congregation means the congregational prayer."

(Another chain) with similar from Abu Rafi.

"I asked 'Ali bin Abi Talib about the prayer of the Messenger of Allah (ﷺ) during the day before the prescribed prayers. He said: 'Who is able to do that?' Then he told us:'The Messenger of Allah (ﷺ) used to pray two Rak'ahs when the sun had passed its zenith, and four Rak'ahs before the middle of the day, with the Taslim at the end."'