Sayyiduna Ubadah bin al-Samit (may Allah be pleased with him) narrates this saying of the Prophet (peace and blessings be upon him): "Whoever is to recite behind the imam should recite Surah al-Fatihah." (Allamah al-Haythami says:) I say: There is a hadith from him in the Sahih, without this wording.
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators have been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2651
Hadith Gradingمحدثین:إسنادہ حسن۔
Hadith Takhrij«أخرجه المعجم الصغير للطبراني برقم: 191»