كتاب الافتتاح
Read the English translation first, with the original Arabic directly underneath.
It was narrated that Ibn Umar said:
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.
أَخْبَرَنَا عَمْرُو بْنُ مَنْصُورٍ، قَالَ حَدَّثَنَا عَلِيُّ بْنُ عَيَّاشٍ، قَالَ حَدَّثَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، قَالَ حَدَّثَنِي سَالِمٌ، ح وَأَخْبَرَنِي أَحْمَدُ بْنُ مُحَمَّدِ بْنِ الْمُغِيرَةِ، قَالَ حَدَّثَنَا عُثْمَانُ، - هُوَ ابْنُ سَعِيدٍ - عَنْ شُعَيْبٍ، عَنْ مُحَمَّدٍ، - وَهُوَ الزُّهْرِيُّ - قَالَ أَخْبَرَنِي سَالِمُ بْنُ عَبْدِ اللَّهِ بْنِ عُمَرَ، عَنِ ابْنِ عُمَرَ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم إِذَا افْتَتَحَ التَّكْبِيرَ فِي الصَّلاَةِ رَفَعَ يَدَيْهِ حِينَ يُكَبِّرُ حَتَّى يَجْعَلَهُمَا حَذْوَ مَنْكِبَيْهِ وَإِذَا كَبَّرَ لِلرُّكُوعِ فَعَلَ مِثْلَ ذَلِكَ ثُمَّ إِذَا قَالَ " سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ " . فَعَلَ مِثْلَ ذَلِكَ وَقَالَ " رَبَّنَا وَلَكَ الْحَمْدُ " . وَلاَ يَفْعَلُ ذَلِكَ حِينَ يَسْجُدُ وَلاَ حِينَ يَرْفَعُ رَأْسَهُ مِنَ السُّجُودِ .