Musnad Abu Ya'la al-Mawsili 42:248

Abu Khaythama narrated to us, Muhammad ibn Abd Allah al-Zubayri Abu Ahmad narrated to us, Kathir ibn Zayd informed us, from Rabih ibn Abd al-Rahman ibn Abi Sa’id, from his father, from Abu Sa’id, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "There is no ablution for the one who does not mention the name of Allah over it."