Sunan of Abu Dawood Book 2, Hadith 745

حَدَّثَنَا حَفْصُ بْنُ عُمَرَ، حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، عَنْ نَصْرِ بْنِ عَاصِمٍ، عَنْ مَالِكِ بْنِ الْحُوَيْرِثِ، قَالَ رَأَيْتُ النَّبِيَّ صلى الله عليه وسلم يَرْفَعُ يَدَيْهِ إِذَا كَبَّرَ وَإِذَا رَكَعَ وَإِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ حَتَّى يَبْلُغَ بِهِمَا فُرُوعَ أُذُنَيْهِ ‏.‏

Malik b. al-Huwairith said:I saw the Prophet (ﷺ) raise his hands when he uttered the takbir (Allah is most great), when he bowed and when he raised his head after bowing until he brought them to the lobes of his ears