Amr (bin Abi Amr) narrates with his chain that the Prophet (peace and blessings be upon him) said: "Accursed is the one who commits bestiality with an animal; and kill both the doer and the one to which it is done, so that it is not said: This is the one with which such and such was done."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحدود / 17036