Sunan An-Nasa'i

It was narrated that Wasi' bin Habban said:""I said to Ibn 'Umar: ""Tell me about the prayer of the Messenger of Allah (ﷺ); how was it?"" He mentioned the takbir and he mentioned: As-salamu 'alaykum wa rahmatullah (peace be upon you and the mercy of Allah) to his right and: As-salamu 'alaykum (peace be upon you) to his left