Saeed bin Yazid, may Allah have mercy on him, says that I asked Hazrat Anas, may Allah be pleased with him, whether the Prophet, peace and blessings be upon him, used to begin the recitation with "Bismillah" or with "Alhamdulillah"? He replied, "You have asked me a question about which no one has asked me before."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 12974