حَدَّثَنَا الرَّبِيعُ بْنُ نَافِعٍ أَبُو تَوْبَةَ، حَدَّثَنَا شَرِيكٌ، عَنْ أَبِي إِسْحَاقَ، قَالَ وَصَفَ لَنَا الْبَرَاءُ بْنُ عَازِبٍ فَوَضَعَ يَدَيْهِ وَاعْتَمَدَ عَلَى رُكْبَتَيْهِ وَرَفَعَ عَجِيزَتَهُ وَقَالَ هَكَذَا كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَسْجُدُ ‏.‏

Maimunah said

When the Prophet(ﷺ) prostrated himself, he kept his arms so far away from his sides that if a lamb had wanted to pass under his arms, it could have done so.