Musannaf Ibn Abi Shayba 18:1198

Abu Bakr narrated to us, he said: Shababa bin Sawwar narrated to us, from Shu'ba, he said: I asked al-Hakam and Hammad about a man who performed ablution and poured water on the road. Hammad said: He is liable. And al-Hakam said: He is not liable.