Sahih Muslim Book - 4, Hadith - 865

حَدَّثَنِي أَبُو كَامِلٍ الْجَحْدَرِيُّ حَدَّثَنَا أَبُو عَوَانَةَ عَنْ قَتَادَةَ عَنْ نَصْرِ بْنِ عَاصِمٍ عَنْ مَالِكِ بْنِ الْحُوَيْرِثِ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ إِذَا كَبَّرَ رَفَعَ يَدَيْهِ حَتَّى يُحَاذِيَ بِهِمَا أُذُنَيْهِ وَإِذَا رَكَعَ رَفَعَ يَدَيْهِ حَتَّى يُحَاذِيَ بِهِمَا أُذُنَيْهِ وَإِذَا رَفَعَ رَأْسَهُ مِنْ الرُّكُوعِ فَقَالَ سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ فَعَلَ مِثْلَ ذَلِكَ.

It was narrated from Abu 'Awanah, from Qatadah, from Nasr bin 'Asim, from Malik bin Al-Huwairith, that when the Messenger of Allah (s.a.w) said the Takbir, he raised his hands until they were level with his ears. When he bowed, he raised his hands until they were level with his ears, and when he raised his head from bowing, he said: "Sami'a Allahu liman hamidah (Allah hears those who praise Him)," and did likewise.