It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Every prayer in which Surah al-Fatihah is not recited is deficient." Al-Ala's father says: I said: O Abu Hurayrah! I hear the recitation of the imam. So he said: O Persian! Or he said: O son of the Persian! Recite it within yourself.
(b) Narrations of recitation behind the imam have reached us from a large group of the Companions (may Allah be pleased with them), among whom is the Commander of the Faithful, Sayyiduna Umar bin al-Khattab (may Allah be pleased with him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2928