He reported him as saying, “There is no prescribed punishment for one who has intercourse with an animal." Tirmidhi and Abu Dawud transmitted it. Tirmidhi quoted Sufyan ath-Thauri as saying that this is sounder than the first tradition, “Kill him who has intercourse with an animal," (Cf. p. 763) and that the learned act according to this one.
Hadith Referenceمشكوة المصابيح / كتاب الحدود / 3586
Hadith Gradingالألبانی:لم تتمّ دراسته | زبیر علی زئی:إسناده حسن
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «إسناده حسن، رواه الترمذي (1455) و أبو داود (4465)»