Musnad Abu Ya'la al-Mawsili 128:8

Muhammad ibn Abi Bakr al-Muqaddami narrated to us, Yahya narrated to us, from Sufyan, 'Amr ibn 'Amir narrated to me, he said: I heard Anas saying: The Messenger of Allah (may Allah bless him and grant him peace) used to perform ablution for every prayer. He (the narrator) said: So what do you do? He said: We suffice with the ablution as long as we do not break it.