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. (Using translation from Abū Dāʾūd 898)  

أَنَّ النَّبِيَّ ﷺ كَانَ «إِذَا سَجَدَ جَافَى يَدَيْهِ حَتَّى لَوْ أَنَّ بَهْمَةً أَرَادَتْ أَنْ تَمُرَّ تَحْتَ يَدَيْهِ لَمَرَّتْ»