Raising the hands when bowing, and when raising the head from bowing
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا أَبُو عَامِرٍ، حَدَّثَنَا فُلَيْحُ بْنُ سُلَيْمَانَ، حَدَّثَنَا عَبَّاسُ بْنُ سَهْلٍ السَّاعِدِيُّ، قَالَ اجْتَمَعَ أَبُو حُمَيْدٍ وَأَبُو أُسَيْدٍ السَّاعِدِيُّ وَسَهْلُ بْنُ سَعْدٍ وَمُحَمَّدُ بْنُ مَسْلَمَةَ فَذَكَرُوا صَلاَةَ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ فَقَالَ أَبُو حُمَيْدٍ أَنَا أَعْلَمُكُمْ بِصَلاَةِ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ إِنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ قَامَ فَكَبَّرَ وَرَفَعَ يَدَيْهِ، ثُمَّ رَفَعَ حِينَ كَبَّرَ لِلرُّكُوعِ، ثُمَّ قَامَ فَرَفَعَ يَدَيْهِ، وَاسْتَوَى حَتَّى رَجَعَ كُلُّ عَظْمٍ إِلَى مَوْضِعِهِ .
‘Abbas bin Sahl As-Sa’di said: “Abu Humaid, Abu Usaid As-Sa’di, Sahl bin Sa’d, and Muhammad bin Maslamah came together and spoke about the prayer of the Messenger of Allah (ﷺ). Abu Humaid said: ‘I am the most knowledgeable of you about the prayer of the Messenger of Allah (ﷺ). The Messenger of Allah (ﷺ) stood up and said Allahu Akbar, and raised his hands, then he raised them when he said Allahu Akbar for Ruku’, then he stood up and raised his hands, and stood straight until every bone had returned to its place.’”