In the name of allah, the Beneficent, the Merciful What is sin in Islam?

And in the Hadith reported by Raf’a ibn Khadeej (RA),

The Prophet (SAW) told the Companions to use "anything that releases the blood, and mention the Name of Allah over it, but do not use a tooth or a nail, for a tooth is bone, and nails are the knives of the Ethiopians." (Reported by Al-Bukhari, Muslim and others)

It is said that Ethiopians at the time used to kill their animals in the fashion to show their courage and strength.

In a lengthy discussion of all possible objects for slaughter, Ibn Rushd said: "It does not make sense to differentiate between teeth and bones for he [the Prophet (SAW)] explained that a tooth is not a good tool by the fact that it is made of bone. And it is well agreed upon in our Madh-hab that anything other than iron is disliked (that is, when iron objects are available) because the Prophet (SAW) has said:

"If you slaughter, then slaughter in the best way. One should sharpen his edge and comfort gently his animal." (Bidaiatul Mujtahid V1 / P433)