Sahih Muslim Book 5, Hadith Number 2162.

This Hadith has been narrated by Zaid b. Aslam with the same chain of transmitters except that he said: “None among the owners of camels who does not pay their due,” but did not say “their due (Zakat) out of them.” and he make a mention: “He did not miss a single young one out of them.” and he said: “Their sides, their foreheads and their backs would be cauterised.”