"Abu Mus'ad said: 'Shall I not show you how the Messenger of Allah ﷺ prayed?' We said: 'Yes.' So he stood up and said the takbir, and when he bowed, he held his arms out from his sides until, when every part of him settled, he raised his head. He prayed four rak'ahs like that, and said: 'This is how I saw the Messenger of Allah ﷺ praying.'" (Using translation from Nasāʾī 1038)  

قَالَ أَبُو مَسْعُودٍ وَهُوَ الْأَنْصَارِيُّ أَلَا أُرِيَكُمْ كَيْفَ كَانَ رَسُولُ اللهِ ﷺ يُصَلِّي؟ فَقُلْنَا بَلَى فَقَامَ فَكَبَّرَ فَلَمَّا رَكَعَ جَافَى بَيْنَ إِبِطَيْهِ حَتَّى لَمَّا اسْتَقَرَّ كُلُّ شَيْءٍ مِنْهُ رَفَعَ رَأْسَهُ فَصَلَّى أَرْبَعَ رَكَعَاتٍ هَكَذَا وَقَالَ «هَكَذَا رَأَيْتُ رَسُولَ اللهِ ﷺ يُصَلِّي»