[Machine] Allah hears whomever praises Him. He raises his hands when he stands up from the two rak'ahs, and Ibn 'Umar raised his hands and related this to the Prophet ﷺ.  

سَمِعَ اللهُ لِمَنْ حَمِدَهُ رَفَعَ يَدَيْهِ وَإِذَا قَامَ مِنَ الرَّكْعَتَيْنِ رَفَعَ يَدَيْهِ وَرَفَعَ ذَلِكَ ابْنُ عُمَرَ إِلَى النَّبِيِّ ﷺ  

[Machine] I heard Abu Humaid say that the Messenger of Allah ﷺ, when he stood up for prayer, would face the qiblah and raise his hands until they were level with his shoulders. He would then say "Allahu Akbar". When he went into ruku', he would say "Allahu Akbar" while he was going into ruku' and raise his hands. He would then straighten his back, without making it stiff or flexing it too much. He would then raise his head and say "Sami Allahu liman hamidah". He would then raise his hands until they were level with his shoulders, and he would straighten himself until all his limbs were in the correct position. He would then do the same in the second raka'ah, until he stood up from the two raka'at and said "Allahu Akbar" and raised his hands as he had done at the beginning of the prayer. When it came time for the prostration, he would raise his head and sit cross-legged.  

سَمِعْتُ أَبَا حُمَيْدٍ يَقُولُ كَانَ رَسُولُ اللهِ ﷺ إِذَا قَامَ إِلَى الصَّلَاةِ اسْتَقْبَلَ الْقِبْلَةَ ثُمَّ رَفَعَ يَدَيْهِ حَتَّى يُحَاذِيَ بِهِمَا مَنْكِبَيْهِ ثُمَّ يَقُولُ اللهُ أَكْبَرُ وَإِذَا رَكَعَ كَبَّرَ حِينَ يَرْكَعُ وَيَرْفَعُ يَدَيْهِ ثُمَّ عَدَلَ صُلْبَهُ فَلَمْ يُصَوِّبْهُ وَلَمْ يُقَنِّعْهُ ثُمَّ رَفَعَ رَأْسَهُ فَقَالَ سَمِعَ اللهُ لِمَنْ حَمِدَهُ ثُمَّ رَفَعَ يَدَيْهِ حَتَّى يُحَاذِيَ بِهِمَا مَنْكِبَيْهِ ثُمَّ اعْتَدَلَ حَتَّى جَاءَ كُلُّ عُضْوٍ إِلَى مَوْضِعِهِ مُعْتَدِلًا ثُمَّ يَفْعَلُ فِي الرَّكْعَةِ الْأُخْرَى مِثْلَ ذَلِكَ حَتَّى إِذَا قَامَ مِنَ الرَّكْعَتَيْنِ كَبَّرَ وَرَفَعَ يَدَيْهِ كَمَا صَنَعَ فِي ابْتِدَاءِ الصَّلَاةِ حَتَّى إِذَا كَانَتِ السَّجْدَةُ الَّتِي تَكُونُ حِلَّةَ الصَّلَاةِ رَفَعَ رَأْسَهُ فِيهَا وَقَعَدَ مُتَوَرِّكًا  

[Machine] "I heard Abu Humaid Al-Sa'idi mention ten companions of the Prophet ﷺ , among them Abu Qatadah Al-Harith bin Rabee. Abu Humaid said, 'I know the prayer of the Messenger of Allah ﷺ ,' and then he mentioned the narration in which the Prophet ﷺ raised his hands until they were level with his shoulders when he stood up for prayer, when bowing, and when raising his head from bowing. He said, 'Then when he stood up from the two prostrations, he would say the takbeer and raise his hands until they were level with his shoulders, just as he did when saying the takbeer at the beginning of the prayer. Then he would do the same in the rest of his prayer.' This narration was also reported from Ali ibn Abi Talib from the Prophet ﷺ ."  

سَمِعْتُ أَبَا حُمَيْدٍ السَّاعِدِيَّ فِي عَشَرَةٍ مِنْ أَصْحَابِ النَّبِيِّ ﷺ فِيهِمْ أَبُو قَتَادَةَ الْحَارِثُ بْنُ رِبْعِيٍّ فَقَالَ أَبُو حُمَيْدٍ أَنَا أَعْلَمُكُمْ بِصَلَاةِ رَسُولِ اللهِ ﷺ فَذَكَرَ الْحَدِيثَ وَذَكَرَ فِيهِ رَفَعَ يَدَيْهِ حَتَّى يُحَاذِيَ بِهِمَا مَنْكِبَيْهِ إِذَا قَامَ إِلَى الصَّلَاةِ وَعِنْدَ الرُّكُوعِ وَعِنْدَ رَفْعِ الرَّأْسِ مِنْهُ قَالَ ثُمَّ إِذَا قَامَ مِنَ الرَّكْعَتَيْنِ كَبَّرَ وَرَفَعَ يَدَيْهِ حَتَّى يُحَاذِيَ بِهِمَا مَنْكِبَيْهِ كَمَا فَعَلَ إِذَا كَبَّرَ عِنْدَ افْتِتَاحِ الصَّلَاةِ ثُمَّ صَنَعَ مِثْلَ ذَلِكَ فِي بَقِيَّةِ صَلَاتِهِ وَرُوِيَ ذَلِكَ عَنْ عَلِيِّ بْنِ أَبِي طَالِبٍ ؓ عَنِ النَّبِيِّ ﷺ  

It was narrated from ‘Ali bin Abi Talib ؓ that when the Messenger of Allah ﷺ stood up to offer the prescribed prayer, he would say Allahu Akbar and raise his hands to shoulder height; he did the same when he finished reciting and wanted to bow, and he did it when he raised his head from bowing. He did not raise his hands when sitting in any part of his prayer, but when he stood up following the two prostrations, he raised his hands in the same manner and said Allahu Akbar. (Using translation from Aḥmad 717)   

كَانَ رَسُولُ اللهِ ﷺ إِذَا قَامَ إِلَى الصَّلَاةِ الْمَكْتُوبَةِ كَبَّرَ وَرَفَعَ يَدَيْهِ حَذْوَ مَنْكِبَيْهِ وَيَصْنَعُهُ إِذَا قَضَى قِرَاءَتَهُ وَأَرَادَ أَنْ يَرْكَعَ وَإِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ فَعَلَ مِثْلَ ذَلِكَ وَلَا يَرْفَعُ يَدَيْهِ فِي شَيْءٍ مِنْ صَلَاتِهِ وَهُوَ قَاعِدٌ وَإِذَا قَامَ مِنَ السَّجْدَتَيْنِ كَبَّرَ وَرَفَعَ يَدَيْهِ كَذَلِكَ