Sahih Muslim , Hadith 494 ⓘ
Al-Bira' (b. 'Azib) reported: The Messenger of Allah said. When you prostrate yourself, place the palms of your hands on the ground and raise your elbows.
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ أَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ إِيَادٍ، عَنْ إِيَادٍ، عَنِ الْبَرَاءِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِذَا سَجَدْتَ فَضَعْ كَفَّيْكَ وَارْفَعْ مِرْفَقَيْكَ " .
also referenced under: Book 4, Hadith 266 (In-Book) & Book 4, Hadith 999 (USC-MSA)