“We used to feel sorry for the Messenger of Allah ﷺ because he took pains to keep his arms away from his sides when he prostrated.” (Using translation from Ibn Mājah 886)   

حَدَّثَنَا أَحْمَرُ بْنُ جَزِيٍّ صَاحِبُ رَسُولِ اللهِ ﷺ قَالَ إِنْ كُنَّا لَنَأْوِي إِلَى رَسُولِ اللهِ ﷺ مِمَّا يُجَافِي مِرْفَقَيْهِ عَنْ جَنْبَيْهِ إِذَا سَجَدَ