Hadrat Abu Hurairah Radi Allahu Ta'ala Anhu reported that the Messenger of Allah SallAllaho Alaihi wa Sallam asked Hadrat Ubayy ibn Ka’b Radi Allahu Ta'ala Anhu, “What do you recite (from the Qur’an) in the prayer?” He recited Ummul Qur’an (Surah al-Fatiha). The Messenger of Allah SallAllaho Alaihi wa Sallam said,

والذى نفسى بيده ما أنزلت فى التوراة ولا فى الإنجيل ولا فى الزبور ولا فى الفرقان مثلها
“by Him in Whose power my soul is, nothing like it has been sent down in the Torah, the Injil (Bible), the Zabur, or the Qur’an. It is the Seven oft-repeated verses and the Mighty Qur’an which I have been given.” [Sunan Tirmidhi, Vol. 2, Page 115]