Abdur Rahman bin Mahdi عبد الرحمن بن مهدي · The Book on Salat (Prayer)

A similar narration (from another chain linking to) this chain is also reported.

"I heard the Prophet recite: (Not (the way) of those who earned Your anger, nor those who went astray) and he said: 'Amin.' And he stretched it out with his voice."

from another route: "That he performed Salat during the night with the Prophet" and he mentioned the Hadith.

"When we performed Salat behind Allah's Messenger, he would raise his head from bowing, and no man among us would bend his back until Allah's Messenger prostrated, then we prostrated."

"The Prophet would say the Salam from his right and from his left (saying): (As-Salamu alaikum wa rahmatullah, as-Salamu alaikum wa rahmatullah) 'Peace be upon you, and Allah's mercy. Peace be upon you, and Allah's mercy.'"

The Hadith of Ibn Buhainah is a Hasan Hadith, and this is acted upon according to some of the people of knowledge. It is the opinion of Ash-Shafi'i, he held the view that all prostrations for As-Sahw were to be performed before the Salam, saying: "This one abrogates the other Ahadith" and he mentioned that the last action of the Prophet (ﷺ) was according to this. Ahmad and Ishaq said: "When a man stands up after two Rak'ah, then he…