Sunan Abi Dawud — Zakat (Kitab Al-Zakat) — Hadith No: 1661
Translation
The aforesaid tradition has also been transmitted by ‘Ubaid bin ‘ Umair through a different chain of narrators. This version goes:A man asked: Messenger of Allah (ﷺ), what is due on camels? He replied in a similar way. This version adds "and to lend its udders.”