Sahih Ibn Khuzaymah

Hazrat Abu Salamah bin Abdur Rahman narrates that Sayyiduna Abu Hurairah (may Allah be pleased with him) used to lead us in prayer. When he would stand for prayer, he would say « اللهُ أَكْبَرُ », and when he would go into ruku, and when he intended to prostrate after rising from ruku, he would say « اللهُ أَكْبَرُ ». And when he would raise his head after the first prostration, he would say « اللهُ أَكْبَرُ » for the (second) prostration, and when he would sit after the (second prostration), he would say « اللهُ أَكْبَرُ ». And when he would stand up after two rak‘ahs, he would say « اللهُ أَكْبَرُ ». He would say takbeer in the same way in the second two rak‘ahs as well. Then when he finished with salam, he said: "By the One in Whose hand is my soul, indeed I am the one among you who performs the prayer closest to the prayer of the Messenger of Allah (peace and blessings be upon him). Until he departed from this world, the prayer of the Prophet (peace and blessings be upon him) was like this."