Sunan Ibn Majah, Volume 2, Book 5, Hadith 874 (DarusSalam) ⓘ
It was narrated that ‘Aishah said: “The Messenger of Allah used to bow with his hands on his knees and his upper arms held away from his sides.”
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَبْدَةُ بْنُ سُلَيْمَانَ، عَنْ حَارِثَةَ بْنِ أَبِي الرِّجَالِ، عَنْ عَمْرَةَ، عَنْ عَائِشَةَ، قَالَتْ كَانَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ يَرْكَعُ فَيَضَعُ يَدَيْهِ عَلَى رُكْبَتَيْهِ وَيُجَافِي بِعَضُدَيْهِ .
also referenced under: Hadith 874 (Reference) & Book 5, Hadith 923 (In-Book)