It was narrated that ‘Ali bin Abu Talib said:“When the Prophet (ﷺ) stood up to offer a prescribed prayer, he said Allahu Akbar and raised his hands until they were parallel to his shoulders. When he wanted to bow he did likewise; when he raised his head from bowing he did likewise; and when he stood up after the two prostrations he did likewise.”

English translation · Sunan Ibn Majah