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: "Whoever offers a prayer and does not recite Surah al-Fatihah in it, it is deficient and incomplete."
(b) Through Abdullah bin Ziyad bin Sam'an, al-Ala' also reported from Sayyiduna Abu Hurayrah (may Allah be pleased with him) the words 'Bismillah'.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2367