The Messenger of Allah ﷺ came to us and said: "How is it that I see you lifting your hands like the tails of headstrong horses? Be calm in prayer." He (the narrator) said: He then again came to us and saw us (sitting) in circles. He said: "How is it that I see you in separate groups?" He (the narrator) said: He again came to us and said: "Why don't you draw yourselves up in rows as angels do in the presence of their Lord?" We said: Messenger of Allah, how do the angels draw themselves up in rows in the presence of their Lord? He (the Holy Prophet) said: "They make the first rows complete and keep close together in the row."  

خَرَجَ عَلَيْنَا رَسُولُ اللَّهِ ﷺ فَقَالَ مَا لِي أَرَاكُمْ رَافِعِي أَيْدِيكُمْ كَأَنَّهَا أَذْنَابُ خَيْلٍ شُمْسٍ اسْكُنُوا فِي الصَّلاَةِ قَالَ ثُمَّ خَرَجَ عَلَيْنَا فَرَآنَا حَلَقًا فَقَالَ مَا لِي أَرَاكُمْ عِزِينَ قَالَ ثُمَّ خَرَجَ عَلَيْنَا فَقَالَ أَلاَ تَصُفُّونَ كَمَا تَصُفُّ الْمَلاَئِكَةُ عِنْدَ رَبِّهَا فَقُلْنَا يَا رَسُولَ اللَّهِ وَكَيْفَ تَصُفُّ الْمَلاَئِكَةُ عِنْدَ رَبِّهَا قَالَ يُتِمُّونَ الصُّفُوفَ الأُوَلَ وَيَتَرَاصُّونَ فِي الصَّفِّ  

This hadith has been narrated by A'mash with the same chain of transmitters.  

حَدَّثَنَا الأَعْمَشُ بِهَذَا الإِسْنَادِ نَحْوَهُ  

When we said prayer with the Messenger of Allah ﷺ, we pronounced: Peace be upon you and Mercy of Allah, peace be upon you and Mercy of Allah, and made gesture with the hand on both the sides. Upon this the Messenger of Allah (may peace be upon him said: What do you point out with your hands as if they are the tails of headstrong horses? This is enough for you that one should place one's hand on one's thigh and then pronounce salutation upon one's brother on the right side and then on the left.  

كُنَّا إِذَا صَلَّيْنَا مَعَ رَسُولِ اللَّهِ ﷺ قُلْنَا السَّلاَمُ عَلَيْكُمْ وَرَحْمَةُ اللَّهِ السَّلاَمُ عَلَيْكُمْ وَرَحْمَةُ اللَّهِ وَأَشَارَ بِيَدِهِ إِلَى الْجَانِبَيْنِ فَقَالَ رَسُولُ اللَّهِ ﷺ عَلاَمَ تُومِئُونَ بِأَيْدِيكُمْ كَأَنَّهَا أَذْنَابُ خَيْلٍ شُمُسٍ إِنَّمَا يَكْفِي أَحَدَكُمْ أَنْ يَضَعَ يَدَهُ عَلَى فَخِذِهِ ثُمَّ يُسَلِّمُ عَلَى أَخِيهِ مَنْ عَلَى يَمِينِهِ وَشِمَالِهِ  

We said our prayer with the Messenger of Allah ﷺ and, while pronouncing salutations, we made gestures with our hands (indicating)" Peace be upon you, peace be upon you." The Messenger of Allah ﷺ looked towards us and said: Why is it that you make gestures with your hands like the tails of headstrong horses? When any one of you pro- nounces salutation (in prayer) he should only turn his face towards his companion and should not make a gesture with his hand.  

صَلَّيْتُ مَعَ رَسُولِ اللَّهِ ﷺ فَكُنَّا إِذَا سَلَّمْنَا قُلْنَا بِأَيْدِينَا السَّلاَمُ عَلَيْكُمْ السَّلاَمُ عَلَيْكُمْ فَنَظَرَ إِلَيْنَا رَسُولُ اللَّهِ ﷺ فَقَالَ مَا شَأْنُكُمْ تُشِيرُونَ بِأَيْدِيكُمْ كَأَنَّهَا أَذْنَابُ خَيْلٍ شُمُسٍ إِذَا سَلَّمَ أَحَدُكُمْ فَلْيَلْتَفِتْ إِلَى صَاحِبِهِ وَلاَ يُومِئْ بِيَدِهِ