"I prayed behind the Messenger of Allah ﷺ and when he started to pray he said the Takbir and raised his hands until they were in level with his ears. Then he recited the Opening of the Book, and when he had finished he said 'Amin' and raised his voice with it." (Using translation from Nasāʾī 879)  

صَلَّيْتُ خَلْفَ رَسُولِ اللهِ ﷺ فَلَمَّا افْتَتَحَ الصَّلَاةَ كَبَّرَ وَرَفَعَ يَدَيْهِ حَتَّى حَاذَى بِأُذُنَيْهِ ثُمَّ قَرَأَ بِفَاتِحَةِ الْكِتَابِ فَلَمَّا فَرَغَ مِنْهَا قَالَ «آمِينَ» يَمُدُّ بِهَا صَوْتَهُ  

When the Messenger of Allah ﷺ prayed he would raise his hands-when he said the Takbir- until they were parallel to his ears, and when he wanted to bow and when he raised his head from bowing. (Using translation from Nasāʾī 880)  

عَنْ مَالِكِ بْنِ الْحُوَيْرِثِ وَكَانَ مِنْ أَصْحَابِ النَّبِيِّ ﷺ أَنَّ رَسُولَ اللهِ ﷺ كَانَ إِذَا صَلَّى رَفَعَ يَدَيْهِ حِينَ يُكَبِّرُ حِيَالَ أُذُنَيْهِ وَإِذَا أَرَادَ أَنْ يَرْكَعَ وَإِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ  

"I saw the Messenger of Allah ﷺ, when he started to pray, raise his hands, and when he bowed, and when he raised his head from bowing, until they were parallel with the top of his ears." (Using translation from Nasāʾī 881)  

«رَأَيْتُ رَسُولَ اللهِ ﷺ حِينَ دَخَلَ فِي الصَّلَاةِ رَفَعَ يَدَيْهِ وَحِينَ رَكَعَ وَحِينَ رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ حَتَّى حَاذَتَا فُرُوعَ أُذُنَيْهِ»