Sunan Ibn Majah
858
Sahih+3

It was narrated that Ibn ‘Umar said:“I saw the Messenger of Allah (ﷺ) raising his hands until they were parallel to his shoulders when he started the prayer, and when he bowed in Ruku’, and when he raised his head from Ruku’, but he did not raise them between the two prostrations.”

SahihAl-Albani
SahihMuhammad Fouad Abd al-Baqi