"The Messenger of Allah ﷺ came out to us and we were raising our hands during the Salah. He said: 'Why are you raising your hands while praying, like the tails of wild horses? Stay still when you are praying.'" (Using translation from Nasāʾī 1184)  

خَرَجَ عَلَيْنَا رَسُولُ اللهِ ﷺ وَنَحْنُ يَعْنِي رَافِعُو أَيْدِينَا فِي الصَّلَاةِ فَقَالَ «مَا لَهُمْ رَافِعِينَ أَيْدِيَهُمْ فِي الصَّلَاةِ كَأَنَّهَا أَذْنَابُ الْخَيْلِ الشَّمْسِ اسْكُنُوا فِي الصَّلَاةِ»  

the Messenger of Allah ﷺ once prayed with a sheet of cloth upon him. It had prints and paintings. He said: The prints of this (sheet) distracted my attention; take it to Abu Jahm and bring a blanket to me. (Using translation from Abū Dāʾūd 914)  

أَنَّ النَّبِيَّ ﷺ صَلَّى فِي خَمِيصَةٍ لَهَا أَعْلَامٌ قَالَ «شَغَلَتْنِي أَعْلَامُ هَذِهِ اذْهَبُوا بِهَا إِلَى أَبِي جَهْمٍ وَائْتُونِي بِأَنْبِجَانِيَّةٍ»