(a) Abu Bakr bin Abd al-Rahman and Abu Salamah (may Allah have mercy on them both) say that Sayyiduna Abu Hurayrah (may Allah be pleased with him) used to say the takbir in the obligatory prayer and in other prayers. When he stood up he said the takbir, then he said the takbir at the bowing, then before the prostration 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, while going down for the prostration, he said 'Allahu akbar' (Allah is the Greatest); then, while raising his head from the prostration, he said 'Allahu akbar' (Allah is the Greatest); then he said the takbir for the second prostration as well, and after that he would also say the takbir while rising from the second prostration. When rising from the sitting after two rak'ahs he also said 'Allahu akbar' (Allah is the Greatest). He did this in every rak'ah until he finished the prayer. Once, after the salam, he said: "By the One in whose hand is my soul, of all of you I am the closest to the prayer of the Messenger of Allah (peace and blessings be upon him). This remained his prayer until he departed from this world."
(b) Imam Abu Dawud (may Allah have mercy on him) said: This last statement is narrated by Imam Malik, al-Zubayri and others from al-Zuhri, from Ali bin Husayn.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2494