Language:
كتاب الأذان
10  
Call to Prayers (Adhaan)
(124)
Chapter: What the Imam and the followers say on raising their heads from bowing.
(124)
باب مَا يَقُولُ الإِمَامُ وَمَنْ خَلْفَهُ إِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ
Sahih al-Bukhari 795

Narrated Abu Huraira:

When the Prophet (ﷺ) said, "Sami`a l-lahu liman hamidah," (Allah heard those who sent praises to Him), he would say, "Rabbana wa laka l-hamd." On bowing and raising his head from it the Prophet (ﷺ) used to say Takbir. He also used to say Takbir on rising after the two prostrations. (See Hadith No. 656).

حَدَّثَنَا آدَمُ، قَالَ حَدَّثَنَا ابْنُ أَبِي ذِئْبٍ، عَنْ سَعِيدٍ الْمَقْبُرِيِّ، عَنْ أَبِي هُرَيْرَةَ، قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم إِذَا قَالَ ‏"‏ سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ ‏"‏‏.‏ قَالَ ‏"‏ اللَّهُمَّ رَبَّنَا وَلَكَ الْحَمْدُ ‏"‏‏.‏ وَكَانَ النَّبِيُّ صلى الله عليه وسلم إِذَا رَكَعَ وَإِذَا رَفَعَ رَأْسَهُ يُكَبِّرُ، وَإِذَا قَامَ مِنَ السَّجْدَتَيْنِ قَالَ ‏"‏ اللَّهُ أَكْبَرُ ‏"‏‏.‏
Reference : Sahih al-Bukhari 795
In-book reference : Book 10, Hadith 190
USC-MSA web (English) reference : Vol. 1, Book 12, Hadith 761
  (deprecated numbering scheme)