مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 889
Prayer
Prostration and its Excellence - Section 1
وَعَنِ الْبَرَاءِ بْنِ عَازِبٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: إِذَا سَجَدْتَ فضع كفيك وارفع مرفقيك رَوَاهُ مُسلم
Al-Bara’ b. ‘Azib reported God's Messenger as saying, “When you prostrate yourself, place the palms of your hands on the ground and raise your elbows.” Muslim transmitted it.
Mishkat al-Masabih, 889