It was narrated from Ibn ‘Abbas that the Messenger of Allah (ﷺ) used to raise his hands at every Takbir (saying Allahu Akbar).
Sunan Ibn Majah Book 5, Hadith 63
← Previous Hadith “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.”*

Sunan Ibn Majah Book 5, Hadith 62 Next Hadith → It was narrated from Anas that the Messenger of Allah (ﷺ) used to raise his hands when he entered prayer, and when he bowed in Ruku’.

Sunan Ibn Majah Book 5, Hadith 64