حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ النُّفَيْلِيُّ، حَدَّثَنَا زُهَيْرٌ، حَدَّثَنَا الأَعْمَشُ، عَنِ الْمُسَيَّبِ بْنِ رَافِعٍ، عَنْ تَمِيمٍ الطَّائِيِّ، عَنْ جَابِرِ بْنِ سَمُرَةَ، قَالَ دَخَلَ عَلَيْنَا رَسُولُ اللَّهِ صلى الله عليه وسلم وَالنَّاسُ رَافِعُو أَيْدِيهِمْ - قَالَ زُهَيْرٌ أُرَاهُ قَالَ - فِي الصَّلاَةِ فَقَالَ ‏"‏مَا لِي أَرَاكُمْ رَافِعِي أَيْدِيكُمْ كَأَنَّهَا أَذْنَابُ خَيْلٍ شُمْسٍ اسْكُنُوا فِي الصَّلاَةِ ‏"
Translation
Jabir b. Samurah said

The Messenger of Allah (ﷺ) came out to us while the people were raising their hands—Zuhayr said: I think he said: in the prayer—and said, "What is the matter with me that I see you raising your hands as if they were the tails of wild horses? Be tranquil in the prayer."