Yahya related to me from Malik from Ibn Shihab from Salim ibn Abdullah from Abdullah ibn Umar that the Messengerof Allah ﷺ used to raise his hands to the level of his shoulders when he began the prayer and when he raised his head from the ruku he raised them in the same way, saying, "Allah hears whoever praises him, our Lord and praise belongs to You." He did not raise them in the sujud.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا افْتَتَحَ الصَّلاَةَ رَفَعَ يَدَيْهِ حَذْوَ مَنْكِبَيْهِ وَإِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ رَفَعَهُمَا كَذَلِكَ أَيْضًا وَقَالَ سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ رَبَّنَا وَلَكَ الْحَمْدُ وَكَانَ لاَ يَفْعَلُ ذَلِكَ فِي السُّجُودِ  

[Machine] The Messenger of Allah ﷺ used to raise his hands when he stood up for prayer, until they were level with his shoulders. Then he would say the takbir. When he wanted to bow, he would do the same. And when he raised from bowing, he would do the same. However, he would not do this when he raised his head from prostration.  

كَانَ رَسُولُ اللهِ ﷺ إِذَا قَامَ لِلصَّلَاةِ رَفَعَ يَدَيْهِ حَتَّى تَكُونَا حَذْوَ مَنْكِبَيْهِ ثُمَّ يُكَبِّرُ فَإِذَا أَرَادَ أَنْ يَرْكَعَ فَعَلَ مِثْلَ ذَلِكَ وَإِذَا رَفَعَ مِنَ الرُّكُوعِ فَعَلَ مِثْلَ ذَلِكَ وَلَا يَفْعَلُهُ حِينَ يَرْفَعُ رَأْسَهُ مِنَ السُّجُودِ