Sunan Abi Dawud — Zakat (Kitab Al-Zakat) — Hadith No: 1659
Translation
The above mentioned tradition has also been transmitted by Abu Hurairah through a different chain of narrators in a similar manner from the Prophet (SAWS). This version adds after the words “does not pay what is due on them” in the description of the camels the words “ One thing which is due being to milk them when they come down to drink water.”