Sahih Bukhari

Narrated Mutarrif bin `Abdullah:`Imran bin Husain and I offered the prayer behind `Ali bin Abi Talib. When `Ali prostrated, he said the Takbir, when he raised his head, he said the Takbir and when he got up for the third rak`a he said the Takbir. On completion of the prayer `Imran took my hand and said, ""This (i.e. `Ali) made me remember the prayer of Muhammad"" Or he said, ""He led us in a prayer like that of Muhammad