"Shall I not tell you about the prayer of the Messenger of Allah (ﷺ)? He stood and raised his hands the first time and then he did not do that again."
Sunan an-Nasa'i Book 11, Hadith 151
← Previous Hadith His father said: "I saw the Messenger of Allah (ﷺ) when he started to pray, raise his hands until they were parallel to his shoulders, (and he did that) when he bowed and when he raised his head from bowing."

Sunan an-Nasa'i Book 11, Hadith 150 Next Hadith → "The Messenger of Allah (ﷺ) said: 'The prayer is not valid if a man does not bring his backbone to rest while bowing and prostrating.'"

Sunan an-Nasa'i Book 11, Hadith 152