What is the ruling on using cowhide and animal glue in the binding of the Noble Qur’an, and is it permissible to do so even though the Qur’an is not touched except in a state of purity?

If the glue and leather are from an animal that was slaughtered according to Islamic law (dhakāh) and is permissible to eat, then they are pure and may be used to bind a copy of the Mus'haf (Quran). However, if the glue is from an animal that is not permissible to eat or was not slaughtered according to Islamic law, it is not permissible to use it. Similarly, the hides of animals that died naturally (maytah) and have not been tanned may not be used. If the hides of a maytah are tanned, they become pure according to the Shāfi'īs (except for dogs and pigs) and the Ḥanafīs (except for humans and pigs). In contrast, the Ḥanbalīs and Mālikīs hold that they do not become pure through tanning. Therefore, one should not bind the Mus'haf with tanned hide from a maytah, so as to avoid the scholarly اختلاف (disagreement).