Yahya bin Abi Kathir يحيى بن أبي كثير الطائي · The Book of Forgetfulness (In Prayer)

"The Messenger of Allah (ﷺ) sent me on an errand, then I came back to him while he was facing the east or the west. I greeted him with salam and he gestured to me. Then when he finished he called me and said: "O Jabir!" So I came and said: "O Messenger of Allah, I greeted you with Salam but you did not answer." He said: 'I was praying.'

"The Messenger of Allah (ﷺ) was ill, and we prayed behind him while he was sitting, and Abu Bakr repeated his takbirs so that the people could hear them. He turned to us and saw us standing, so he gestured to us to sit down. So we prayed behind him sitting. When he said the salam he said: 'Just now you were doing what the Persians and Romans do for their kings when they are sitting. Do not do that.…

"The Messenger of Allah (ﷺ) used to turn to his right and left when praying, but he did not twist his neck to look behind him."

Abu Hurairah said: "The Messenger of Allah (ﷺ) stood up to pray and we stood up with him. A Bedouin said- while he was praying- 'O Allah, have mercy on me and Muhammad and do not have mercy on anyone else.' When the Messenger of Allah (ﷺ) said the Salam, he said to the Bedouin: 'You have limited something vast," meaning the mercy of Allah (SWT)."

The Messenger of Allah (ﷺ) said: "Whoever has doubt during his prayer, let him prostrate twice." (One of the narrators) Hajjaj said: "After he has said the taslim." (Another of them) Rawh said: "While he is sitting."

"We fasted Ramadan with the Messenger of Allah (ﷺ), and the Prophet (ﷺ) did not lead us in Qiyam until there were seven days left of the month, then he led us in Qiyam until one-third of the night had passed. Then, when there were six days left, he did not lead us in Qiyam. When there were five days left, he led us in praying Qiyam until half the night had passed. We said: 'O Messenger of Allah (SA),…