Musnad Ahmad 31:380

Zayd ibn al-Hubab narrated to us, he said: Kathir ibn Zayd al-Laythi narrated to me, he said: Rubayh ibn Abd al-Rahman ibn Abi Sa'id al-Khudri narrated to me, from his father, from his grandfather, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "There is no ablution for the one who does not mention the name of Allah upon it."