Prescribed Punishments (Kitab Al-Hudud)
Dawud :: Book 38 : Hadith 4449
Narrated Abdullah ibn Abbas:
The Prophet (peace_be_upon_him) said: If anyone has sexual intercourse with an animal, kill him and kill it along with him. I (Ikrimah) said: I asked him (Ibn Abbas): What offence can be attributed to the animal/ He replied: I think he (the Prophet) disapproved of its flesh being eaten when such a thing had been done to it.