Amr bin 'Uthman عمرو بن عثمان بن عفان · The Book of Purification and its Sunnah

The Messenger of Allah said: "There is no ablution for one who does not mention the Name of Allah (before doing it)."

"May my ears be made deaf, if I did not hear the messenger of Allah saying: 'Perform ablution after (eating) that which has been changed by fire.'"