(10) باب إِثْبَاتِ التَّكْبِيرِ فِي كُلِّ خَفْضٍ وَرَفْعٍ فِي الصَّلاَةِ إِلاَّ رَفْعَهُ مِنَ الرُّكُوعِ فَيَقُولُ فِيهِ سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ
Abu Salama reported that Abu Huraira recited takbir in prayer on all occasions of rising and kneeling. We said:
O Abu Huraira, what is this takbir? He said: Verily it is the prayer of the Messenger of Allah (ﷺ).
Reference: Sahih Muslim 392 e
In-book reference: Book 4, Hadith 34
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 768