It is narrated from Abu Salamah and Abu Bakr bin Abd al-Rahman: We prayed behind Sayyiduna Abu Hurayrah (may Allah be pleased with him). When he bowed he said the takbir, and when he raised his head from the bowing he said 'Sami' Allahu liman hamidah' (Allah hears the one who praises Him) and 'Rabbana wa lakal-hamd' (Our Lord, and to You belongs all praise). Then he prostrated and said 'Allahu akbar' (Allah is the Greatest), then he raised his head from the prostration and said the takbir again, then he said the takbir when rising after the two rak'ahs as well. Then he said: The prayer of the Messenger of Allah (peace and blessings be upon him) remained like this until he (peace and blessings be upon him) departed from this world.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2495