"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.'"  

خَرَجَ عَلَيْنَا رَسُولُ اللَّهِ ﷺ وَنَحْنُ رَافِعُو أَيْدِينَا فِي الصَّلاَةِ فَقَالَ مَا بَالُهُمْ رَافِعِينَ أَيْدِيَهُمْ فِي الصَّلاَةِ كَأَنَّهَا أَذْنَابُ الْخَيْلِ الشُّمُسِ اسْكُنُوا فِي الصَّلاَةِ  

The Messenger of Allah ﷺ entered upon us while the people were raising their hands. The narrator Zubair said: I think( they were raising the hands) during prayer. He (the prophet) said: What is the matter, I see you raising your hands as if they are the tails of restive horses! Maintain tranquility during prayer.  

دَخَلَ عَلَيْنَا رَسُولُ اللَّهِ ﷺ وَالنَّاسُ رَافِعُو أَيْدِيهِمْ قَالَ زُهَيْرٌ أُرَاهُ قَالَ فِي الصَّلاَةِ فَقَالَ مَا لِي أَرَاكُمْ رَافِعِي أَيْدِيكُمْ كَأَنَّهَا أَذْنَابُ خَيْلٍ شُمْسٍ اسْكُنُوا فِي الصَّلاَةِ  

"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»  

[Machine] The Messenger of Allah ﷺ entered upon us while we were raising our hands in prayer and he said, "Why do I see you raising your hands as if they are the tails of galloping horses? Calm down in your prayer."  

دَخَلَ عَلَيْنَا رَسُولُ اللهِ ﷺ وَنَحْنُ رَافِعِي أَيْدِينَا فِي الصَّلَاةِ فَقَالَ مَا لِيَ أَرَاكُمْ رَافِعِي أَيْدِيكُمْ كَأَنَّهَا أَذْنَابُ خَيْلٍ شُمْسٍ اسْكُنُوا فِي الصَّلَاةِ