Musnad Ahmad 1060:25

Qutaybah ibn Sa'id narrated to us, Ibn Lahi'ah narrated to us, from Yazid ibn Abi Habib, from Rashid al-Yafi'i, from Habib ibn Aws, from Abu Ayyub al-Ansari, that he said: We were with the Prophet, may Allah bless him and grant him peace, one day, and food was brought near. I have not seen food that had more blessing in it at the beginning of our eating, nor less blessing at the end of it. We said: "How is this, O Messenger of Allah?" He said: "Because we mentioned the name of Allah when we ate, then someone sat down after having eaten and did not mention the name of Allah, so the devil ate with him."