in it. Whatever is not permitted, where it is capable of being either valid or invalid, does not take legal effect. This is a principle of Sacred Law, as established by the Prophet, may Allah bless him and grant him peace: “Whoever does an act that is not in accordance with our matter shall have it rejected.” (1) Slaughtering property belonging to another is not sanctioned by Allah and His Messenger, may Allah bless him and grant him peace; it is therefore invalid and rejected.
Our qualification in this principle—“where it is capable of being either valid or invalid”—excludes that which is not permitted but can only occur in a prohibited manner. Such an act does take legal effect, as in ẓihār, which is not permitted yet takes effect despite being prohibited, reprehensible, and false speech, because it does not admit of valid and invalid forms; all of its forms are wrongful.
The second view is that what is prohibited due to another person’s right remains lawful. This is because the slaughter has been performed by someone qualified to slaughter, and the animal is not inviolable or forbidden in itself; rather, the prohibition and inviolability arise from the right of a human being, not from the animal itself. This differs from game hunted while one is in the state of pilgrimage consecration, or within the Sacred Precinct, for such game is prohibited in itself. That is why hunting it and eating it are forbidden.
This latter view is the established position of the school: the meat is lawful, though the slaughterer incurs sin, and this is the stronger view. If it is lawful, does that mean it is permissible to eat it? No, it is not permissible to eat it—not because the slaughter itself is forbidden, but because it is another person’s property. Thus, if someone unlawfully usurped meat that its owner had already slaughtered, it would be forbidden for him to eat it. If its owner then gave him permission, it would become lawful.
His statement, “It is disliked to slaughter with a dull instrument”: the root meaning of dullness is fatigue. A dull instrument is one worn down by use and no longer sharp.