It is narrated from ‘Ubadah bin Samit (may Allah be pleased with him) that the Messenger of Allah (ﷺ) said: “The prayer of that person is not valid who did not recite Surah Al-Fatihah (in the prayer).”
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 211
Hadith Takhrijأخرجہ البخاری، الاذان، باب وجوب القراءۃ للامام والمأموم فی الصلوات کلہا... الخ: 756 - ومسلم، الصلاۃ، باب وجوب قراءۃ الفاتحۃ فی کل رکعۃ... الخ: 394۔
It is narrated from Abu Huraira (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Every prayer in which Umm al-Kitab (Al-Fatiha) is not recited is incomplete, it is incomplete."
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 212
Hadith Takhrijأخرجہ مسلم، الصلاۃ، باب وجوب قراءۃ الفاتحۃ فی کل رکعۃ... الخ: 395۔