Sunan Abi Dawud Book 2, Hadith 356
If I were in front of the Prophet (ﷺ), I would see his armpits. Ibn Mu'adh added that Lahiq said: Do you not see, AbuHurayrah could not stand in front of the Prophet (ﷺ) while he was praying. Musa added: When he uttered the takbir, he raised his hands.
I saw the Prophet (ﷺ) raise his hands when he uttered the takbir (Allah is most great), when he bowed and when he raised his head after bowing until he brought them to the lobes of his ears.
The Messenger of Allah (ﷺ) taught us how to pray. He then uttered the takbir (Allah is most great) and raised his hands; when he bowed, he joined his hands and placed them between his knees. When this (report) reached Sa'd, he said: My brother said truly. We used to do this; then we were later on commanded to do this, that is, to place the hands on the knees.