Sahih Muslim Book 4, Hadith Number 773.

Chapter : The reciting of Takbir at the time of bowing and rising in prayer except rising after Ruku’ when it is said: Allah listened to him who praised Him.

Mahmud b. al-Rabi’, on whose face the Messenger of Allah (may peace be upon him) squirted water from the well, reported on the authority of ‘Ubada b. as-Samit that the Messenger of Allah (may peace be upon him) said: He who does not recite Umm Al-Qur’an is not credited with having observed prayer.