Ubada b. as-Samit reported from the Messenger of Allah (may peace be upon him ):He who does not recite Fatihat al-Kitab is not credited with having observed the prayer

Ubada b. as-Samit reported:The Messenger of Allah (ﷺ) said: He who does not recite Umm al-Qur'an is not credited with having observed the prayer

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

This hadith has also been transmitted by Ma'mar from al-Zuhri with the same chain of transmitters with the addition of these words:" and something more