al-Aswad bin Yazid الأسود بن يزيد بن قيس النخعي · The Book of Forgetfulness (In Prayer)

"I heard Ash-Sha'bi say: 'Alqamah bin Qais forgot (and made a mistake) in his prayer, and they told him about that after he had spoken, He said: 'Is that true, O odd-eyed one?' He said: 'Yes.' So he undid his cloak, then he performed two prostrations of forgtfulness,and said: 'This is what the Messenger of Allah (ﷺ) did.' He said: And I heard Al-Hakam say: 'Alqamah had prayed five.'"

"I used to see the Messenger of Allah (ﷺ) saying the taslim to his right and to his left until the whiteness of his cheek could be seen."

"The Messenger of Allah (ﷺ) used to say the salam to his right so that the whiteness of his cheek could be seen, and to his left so that the whiteness of his cheek could be seen."

"I said to Jabir bin Samurah: 'Did you used to sit with the Messenger of Allah (ﷺ)?" He said: 'Yes.' When the Messenger of Allah (ﷺ) had prayed fajr, he would sit in the place where he had prayed until the sun rose, and his companions would talk and remember things from the time of Jahilliyah and recite poetry, and they would laugh and he would smile.'"