It was narrated that 'Aishah said:
"I heard the Messenger of Allah (ﷺ) say: 'Every prayer in which the Ummul-Kitab (the Mother of the Book) is not recited is deficient.'" (IT)
English reference (IT): Vol. 1, Book 5, Hadith 840 (IT)
Arabic reference (IT): Book 5, Hadith 889 (IT)