(124) باب مَا يَقُولُ الإِمَامُ وَمَنْ خَلْفَهُ إِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ
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).
Reference: Sahih al-Bukhari 795
In-book reference: Book 10, Hadith 190
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 12, Hadith 761