Sunan Abi Dawud Book 2, Hadith 336
I purposely looked at the prayer of the Messenger of Allah (ﷺ), how he offered it. The Messenger of Allah (ﷺ) stood up, faced the direction of the qiblah and uttered the takbir (Allah is most great) and then raised his hands in front of his ears, then placed his right hand on his left (catching each other).
When he was about to bow, he raised them in the same manner. He then placed his hands on his knees. When he raised his head after bowing, he raised them in the like manner. When he prostrated himself he placed his forehead between his hands.
He then sat down and spread his left foot and placed his left hand on his left thigh, and kept his right elbow aloof from his right thigh. He closed his two fingers and made a circle (with the fingers).
I (Asim ibn Kulayb) saw him (Bishr ibn al-Mufaddal) say in this manner. Bishr made the circle with the thumb and the middle finger and pointed with the forefinger.
Wa’il b.Hujr said that he saw the Messenger of Allah(ﷺ) raise his hands when he uttered the takbir (Allah is most great).
“He then placed his right hand on the back of his left palm and his wrist and forearm.” This also adds: “I then came back afterwards in a season when it was severe cold. I saw the people putting on heavy clothes moving their hands under the clothes (i.e. raised their hands before and after bowing).”