Ibn Umar reported that the Messenger of Allah ﷺ, when he stood up for prayer, used to raise his hands apposite the shoulders and then recited takbir (Allah-o-Akbar), and when he was about to bow he again did like it and when he raised himself from the ruku' (bowing posture) he again did like it, but he did not do it at the time of raising his head from prostration.  

كَانَ رَسُولُ اللَّهِ ﷺ إِذَا قَامَ لِلصَّلاَةِ رَفَعَ يَدَيْهِ حَتَّى تَكُونَا حَذْوَ مَنْكِبَيْهِ ثُمَّ كَبَّرَ فَإِذَا أَرَادَ أَنْ يَرْكَعَ فَعَلَ مِثْلَ ذَلِكَ وَإِذَا رَفَعَ مِنَ الرُّكُوعِ فَعَلَ مِثْلَ ذَلِكَ وَلاَ يَفْعَلُهُ حِينَ يَرْفَعُ رَأْسَهُ مِنَ السُّجُودِ  

When the Prophet of Allah ﷺ started to pray, he raised his hands, and when he bowed, he did likewise, and when he raised his head from bowing he did likewise, and when he raised his head from prostration, he did likewise, meaning he raised his hands.  

أَنَّ نَبِيَّ اللَّهِ ﷺ كَانَ إِذَا دَخَلَ فِي الصَّلاَةِ رَفَعَ يَدَيْهِ وَإِذَا رَكَعَ فَعَلَ مِثْلَ ذَلِكَ وَإِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ فَعَلَ مِثْلَ ذَلِكَ وَإِذَا رَفَعَ رَأْسَهُ مِنَ السُّجُودِ فَعَلَ مِثْلَ ذَلِكَ كُلَّهُ يَعْنِي رَفْعَ يَدَيْهِ  

When the Messenger of Allah ﷺ uttered the takbir (Allah is most great) for prayer (in the beginning), he raised his hands opposite to his shoulders; and when he bowed, he did like that; and when he raised his head to prostrate, he did like that; and when he got up at the end of two rak'ahs, he did like that.  

أَنَّهُ قَالَ كَانَ رَسُولُ اللَّهِ ﷺ إِذَا كَبَّرَ لِلصَّلاَةِ جَعَلَ يَدَيْهِ حَذْوَ مَنْكِبَيْهِ وَإِذَا رَكَعَ فَعَلَ مِثْلَ ذَلِكَ وَإِذَا رَفَعَ لِلسُّجُودِ فَعَلَ مِثْلَ ذَلِكَ وَإِذَا قَامَ مِنَ الرَّكْعَتَيْنِ فَعَلَ مِثْلَ ذَلِكَ  

“When the Prophet ﷺ stood up to offer a prescribed prayer, he said Allahu Akbar and raised his hands until they were parallel to his shoulders. When he wanted to bow he did likewise; when he raised his head from bowing he did likewise; and when he stood up after the two prostrations he did likewise.”*  

كَانَ النَّبِيُّ ﷺ إِذَا قَامَ إِلَى الصَّلاَةِ الْمَكْتُوبَةِ كَبَّرَ وَرَفَعَ يَدَيْهِ حَتَّى يَكُونَا حَذْوَ مَنْكِبَيْهِ وَإِذَا أَرَادَ أَنْ يَرْكَعَ فَعَلَ مِثْلَ ذَلِكَ وَإِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ فَعَلَ مِثْلَ ذَلِكَ وَإِذَا قَامَ مِنَ السَّجْدَتَيْنِ فَعَلَ مِثْلَ ذَلِكَ  

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)   

كَانَ النَّبِيُّ ﷺ إِذَا افْتَتَحَ الصَّلَاةَ رَفَعَ يَدَيْهِ حَذْوَ مَنْكِبَيْهِ فَإِذَا رَكَعَ فَعَلَ مِثْلَ ذَلِكَ وَإِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ فَعَلَ مِثْلَ ذَلِكَ وَقَالَ «سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ اللَّهُمَّ رَبَّنَا وَلَكَ الْحَمْدُ» وَلَا يَفْعَلُ ذَلِكَ فِي السُّجُودِ  

[Machine] The Messenger of Allah ﷺ used to raise his hands to the level of his shoulders when he would say the takbeer in prayer and when he would bow, he would do the same. And when he would raise his head, he would also do the same. And when he would say "Allah hears the one who praises Him," he would say "Our Lord, to You is the praise" and he would do the same. And he would not do this during prostration.  

أَنَّ رَسُولَ اللهِ ﷺ «كَانَ إِذَا كَبَّرَ فِي الصَّلَاةِ رَفَعَ يَدَيْهِ حِذَاءَ مَنْكِبَيْهِ وَإِذَا رَكَعَ فَعَلَ مِثْلَ ذَلِكَ وَإِذَا رَفَعَ رَأْسَهُ فَعَلَ مِثْلَ ذَلِكَ» وَإِذَا قَالَ «سَمِعَ اللهُ لِمَنْ حَمِدَهُ» قَالَ «رَبَّنَا لَكَ الْحَمْدُ وَفَعَلَ مِثْلَ ذَلِكَ وَلَا يَفْعَلُ فِي السُّجُودِ»  

When the Prophet of Allah ﷺ started to pray, he raised his hands, and when he bowed, he did likewise, and when he raised his head from bowing he did likewise, and when he raised his head from prostration, he did likewise, meaning he raised his hands. (Using translation from Nasāʾī 1143)  

أَنَّ نَبِيَّ اللهِ ﷺ كَانَ «إِذَا دَخَلَ فِي الصَّلَاةِ وَإِذَا رَكَعَ فَعَلَ مِثْلَ ذَلِكَ وَإِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ فَعَلَ مِثْلَ ذَلِكَ وَإِذَا رَفَعَ رَأْسَهُ مِنَ السُّجُودِ فَعَلَ مِثْلَ ذَلِكَ كَأَنَّهُ يَعْنِي رَفَعَ يَدَيْهِ»