Sahih al-Bukhari, Hadith 825 ⓘ
Narrated Sa`id bin Al-Harith: Abu Sa`id led us in the prayer and said the Takbir aloud on arising from the prostration, and on prostrating, on rising again, and on getting up from the second rak`a. Abu Sa`id said, "I saw the Prophet doing the same."
حَدَّثَنَا يَحْيَى بْنُ صَالِحٍ، قَالَ حَدَّثَنَا فُلَيْحُ بْنُ سُلَيْمَانَ، عَنْ سَعِيدِ بْنِ الْحَارِثِ، قَالَ صَلَّى لَنَا أَبُو سَعِيدٍ فَجَهَرَ بِالتَّكْبِيرِ حِينَ رَفَعَ رَأْسَهُ مِنَ السُّجُودِ، وَحِينَ سَجَدَ، وَحِينَ رَفَعَ، وَحِينَ قَامَ مِنَ الرَّكْعَتَيْنِ وَقَالَ هَكَذَا رَأَيْتُ النَّبِيَّ صلى الله عليه وسلم.
also referenced under: Book 10, Hadith 219 (In-Book) & Volume 1, Book 12, Hadith 788 (USC-MSA)