The Book of the Commencement of the Prayer

Sunan al-Nasa'i

When the Messenger of Allah (ﷺ) prayed he would raise his hands-when he said the Takbir- until they were parallel to his ears, and when he wanted to bow and when he raised his head from bowing.

Sunan al-Nasa'i

"I saw the Messenger of Allah (ﷺ), when he started to pray, raise his hands, and when he bowed, and when he raised his head from bowing, until they were parallel with the top of his ears."

Sunan al-Nasa'i

I saw the Messenger of Allah (ﷺ) when he said the opening Takbir of the prayer, raise his hands until they were level with his shoulders. When he said the Takbir before bowing he did likewise, and when he said:...