the private part of an animal is never lawful; thus, it is like sodomy. However, the hadith is weak. Therefore, when the scholars deemed the hadith weak, they adopted the lesser of the two measures: killing the animal. As for the human being, he is not to be killed, for his sanctity is greater; rather, he is to be subjected to discretionary punishment, because this is an act of disobedience. The general rule is that discretionary punishment is obligatory for every sin for which there is neither a prescribed punishment nor an expiation.
If someone were to ask: What is the evidence that intercourse with an animal is sinful?
We reply: Allah, Exalted is He, says:
“Those who guard their private parts, except from their wives or those their right hands possess, for then they are free from blame. But whoever seeks beyond that, then they are the transgressors.” [al-Mu’minun 23:5–7]
Thus, anything beyond wives and those whom one’s right hand possesses is considered transgression and wrongdoing.
The apparent meaning of the author’s words is that there is no difference between fornication or adultery with women who are unmarriageable relatives and with others. However, the correct view is that fornication or adultery with an unmarriageable relative entails execution in every case, based on an authentic hadith reported concerning this (1). This is also one narration from Ahmad, and it is the sound position. Ibn al-Qayyim likewise preferred it in his book al-Jawab al-Kafi: whoever commits fornication or adultery with an unmarriageable relative is to be executed in every case, such as if he commits fornication or adultery