Sahih al-Bukhari 764

Az-Zuhri related that Abu Bakr ibn 'Abdu'r-Rahman ibn Harith ibn Hisham and Abu Salama ibn 'Abdu'r-Rahman said that Abu Hurayra used to say the takbir in every prayer whether obligatory or otherwise, in Ramadan or other months. He would say the takbir when he stood up and then again when he went into ruku' and then he would say, "Allah hears whoever praises Him," following it with "Our Lord, praise belongs to You," before going into sajda. Then he would say, "Allah is greater," when going down into sajda and would say the takbir again when raising his head from sajda. He would also say the takbir when he stood up from sitting after the first two rak'ats. He would do that in every rak'at until he finished the prayer. Then when he finished he would say, "By the One in whose hand my self is, of all of you my prayer most closely resembles that of the Messenger of Allah, may Allah bless him and grant him peace. This was his prayer until he left this world."