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.'" (DE)
English reference (DE): Vol. 1, Book 5, Hadith 840 (DE)
Arabic reference (DE): Book 5, Hadith 889 (DE)