It is narrated from Sayyiduna Ubadah bin al-Samit (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "There is no prayer for the one who does not recite Surah al-Fatihah."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2467
It is narrated from Ata that Sayyiduna Abu Hurayrah (may Allah be pleased with him) said: "Recitation is to be done in every prayer." What the Messenger of Allah (peace and blessings be upon him) let us hear, we have let you hear, and what was kept hidden from us, we have kept hidden from you as well. A man said: What is your view if I do not recite more than Surah al-Fatihah? He (may Allah be pleased with him) said: If you recite more than it, that is better, and if you suffice with it, that is also enough.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2468
It is narrated from Ikrimah that Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: "The Messenger of Allah (peace and blessings be upon him) prayed two rak'ahs, and in them he recited nothing except Surah al-Fatihah."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2469
Likewise Abd al-Malik bin al-Khattab narrated from Hanzalah al-Sadusi that he (peace and blessings be upon him) offered a prayer and recited nothing in it except Surah al-Fatihah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2470
(a) It is reported from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) prayed two rak'ahs and recited nothing more than Surah al-Fatihah.
(b) From the words of Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both), the permissibility of sufficing with Surah al-Fatihah alone is known.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2471