Musannaf Ibn Abi Shayba 16:274

Abu Bakr narrated to us, he said: Abu Khalid al-Ahmar narrated to us, from Hajjaj, from Riyah ibn Ubaydah, from a freed slave of Abu Sa’id, from Abu Sa’id, who said: When the Messenger of Allah (may Allah bless him and grant him peace) ate food, he would say: "Praise be to Allah who fed us and gave us drink, and made us Muslims."