It is narrated from Hazrat Aisha (may Allah be pleased with her) that I heard the Prophet (peace and blessings be upon him) say: Whoever offers a prayer and does not recite Surah Al-Fatihah in it, his prayer is incomplete.
Hadith Referenceمسند احمد / مسند النساء / 25099
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد حسن من أجل محمد بن إسحاق وقد صرح بالتحديث