The people were ordered to place the right hand on the left forearm in the prayer. Abu Hazim said, "I knew that the order was from the Prophet (ﷺ) ."
Sahih al-Bukhari Book 10, Hadith 134
← Previous Hadith Whenever Ibn `Umar started the prayer with Takbir, he used to raise his hands: whenever he bowed, he used to raise his hands (before bowing) and also used to raise his hands on saying, "Sami`a l-lahu liman hamidah", and he used to do the same on rising from the second rak`a (for the 3rd rak`a). Ibn `Umar said: "The Prophet (ﷺ) used to do the same."

Sahih al-Bukhari Book 10, Hadith 133 Next Hadith → Allah's Messenger (ﷺ) said, "You see me facing the Qibla; but, by Allah, nothing is hidden from me regarding your bowing and submissiveness and I see you from behind my back."

Sahih al-Bukhari Book 10, Hadith 135