I saw the Messenger of Allah ﷺ when he said the opening Takbir of the prayer, raise his hands until they were level with his shoulders. When he said the Takbir before bowing he did likewise, and when he said: 'Sami Allahu liman hamidah (Allah hears those who praise Him),' he did likewise, then he said: 'Rabbana wa lakal-hamd (Our Lord, to You be praise).' But he did not do that when he prostrated or when he raised his head from prostration. (Using translation from Nasāʾī 876)   

رَأَيْتُ رَسُولَ اللهِ ﷺ إِذَا افْتَتَحَ التَّكْبِيرَ فِي الصَّلَاةِ رَفَعَ يَدَيْهِ حِينَ يُكَبِّرُ حَتَّى يَجْعَلَهُمَا حَذْوَ مَنْكِبَيْهِ ثُمَّ إِذَا كَبَّرَ لِلرُّكُوعِ فَعَلَ مِثْلَ ذَلِكَ ثُمَّ إِذَا قَالَ سَمِعَ اللهُ لِمَنْ حَمِدَهُ فَعَلَ مِثْلَ ذَلِكَ وَقَالَ رَبَّنَا وَلَكَ الْحَمْدُ وَلَا يَفْعَلُ ذَلِكَ حِينَ يَسْجُدُ وَلَا حِينَ يَرْفَعُ رَأْسَهُ مِنَ السُّجُودِ  

[Machine] When he (referring to the person mentioned in the passage) arrived in the presence of the Messenger of Allah ﷺ, he saw him raising his hands while saying Takbir and placing his right hand over his left hand in prayer, and also prostrating between his two palms.  

أَنَّهُ كَانَ حِينَ قَدِمَ عَلَى رَسُولِ اللهِ ﷺ رَآهُ يَرْفَعُ يَدَيْهِ مَعَ التَّكْبِيرِ وَيَضَعُ الْيُمْنَى عَلَى الْيُسْرَى فِي الصَّلَاةِ وَيَسْجُدُ بَيْنَ كَفَّيْهِ وَكَذَلِكَ  

[Machine] I prayed behind the Messenger of Allah, ﷺ . When he said the takbeer, he raised his hands. And when he went into rukoo' (bowing), prostration, and when he raised his head from prostration, I saw him giving the salutation to the right and left.  

صَلَّيْتُ خَلْفَ رَسُولِ اللهِ ﷺ فَلَمَّا كَبَّرَ رَفَعَ يَدَيْهِ مَعَ التَّكْبِيرِ وَإِذَا رَكَعَ وَإِذَا رَفَعَ أَوْ قَالَ سَجَدَ وَرَأَيْتُهُ يُسَلِّمُ عَنْ يَمِينِهِ وَعَنْ شِمَالِهِ