Volume 4, Book 52, Number 309 :
Narrated by Abaya bin Rifaa
My grandfather, Rafi (radiallaahu `anhu) said, “We were in the company of the Prophet (sallallaahu `alayhi wasallam) at DhulHulaifa, and the people suffered from hunger. We got some camels and sheep (as booty) and the Prophet (sallallaahu `alayhi wasallam) was still behind the people. They hurried and put the cooking pots on the fire. (When he came) he ordered that the cooking pots should be upset and then he distributed the booty (amongst the people) regarding ten sheep as equal to one camel then a camel fled and the people chased it till they got tired, as they had a few horses (for chasing it). So a man threw an arrow at it and caused it to stop (with Allah’s Permission). On that the Prophet (sallallaahu `alayhi wasallam) said, ‘Some of these animals behave like wild beasts, so, if any animal flee from you, deal with it in the same way.” My grandfather asked (the Prophet (sallallaahu `alayhi wasallam)), “We hope (or are afraid) that we may meet the enemy tomorrow and we have no knives. Can we slaughter our animals with canes?” Allah’s Apostle (sallallaahu `alayhi wasallam) replied, “If the instrument used for killing causes the animal to bleed profusely and if Allah’s Name is mentioned on killing it, then eat its meat (i.e. it is lawful) but won’t use a tooth or a nail and I am telling you the reason: A tooth is a bone (and slaughtering with a bone is forbidden ), and a nail is the slaughtering instrument of the Ethiopians.”
In a past post, the proper Islamic etiquette of slaughtering an animal was discussed in detail, from saying Bismillah in the beginning to sharpening the blade and being kind to the animal. This hadith discusses the “instrument” used to slaughter the animal. It’s apparent and obvious that bones and nails are prohibited. And whatever is used other than that must cause the animal to bleed profusely.
Having said that, there’s a lot of confusion about saying Bismillah when using modern methods (i.e. machines) to slaughter chickens, whether to say it every time a chicken is slaughtered or to say it once before turning on the machine. A question is recorded in Fataawa al-Lajnah ad-Daa’imah:
Is it permissible to say “Bismillah” when operating the machine which does one repeated movement. Please note that what is meant is saying “Bismillah” only once, when starting the machine for slaughter.
Answer: it is acceptable for the person who is operating the machine to say “Bismillah” once when starting it for a number of (chickens) with the intention of slaughtering them, so long as the one who is operating it is a Muslim or a Jew or a Christian.
‘Abdullah ibn Ghadyaan, ‘Abd ar-Razaaq ‘Afeefi, ‘Abd al-‘Azeez ibn ‘Abdullah ibn Baaz. End quote.
More about stunning animals, saying Bismillah once or repeatedly and other related discussion here.
Volume 3, Book 49, Number 866 :
Narrated by Anas (radiallaahu `anhu)
Ar-Rabi, the daughter of An-Nadr broke the tooth of a girl, and the relatives of Ar-Rabi’ requested the girl’s relatives to accept the Arsh (الأَرْشَ) (compensation for wounds etc.) and forgive (the offender), but they refused. So, they went to the Prophet (sallallaahu `alayhi wasallam) who ordered them to bring about retaliation. Anas bin An-Nadr (radiallaahu `anhu) asked, “O Allah’s Apostle! Will the tooth of Ar-Rabi’ be broken? No, by Him Who has sent you with the Truth, her tooth will not be broken.” The Prophet (sallallaahu `alayhi wasallam) said, “O Anas! Allah’s law ordains retaliation.” Later the relatives of the girl agreed and forgave her. The Prophet (sallallaahu `alayhi wasallam) said, “There are some of Allah’s slaves who, if they take an oath by Allah, are responded to by Allah i.e. their oath is fulfilled). Anas (radiallaahu `anhu) added, “The people agreed and accepted the Arsh.”
There was another post about breaking someone’s teeth a while ago in which Prophet (sallallaahu `alayhi wasallam) ruled in favor of the defender since he broke the other’s tooth while fending for himself.
In this case, however, the defender was given the choice to either forgive Rabi` (offender), accept Arsh (compensation) or to get qisaas (retaliation). Prophet (sallallaahu `alayhi wasallam) would have made sure that qisaas took place had they not forgiven Rabi`. Allah’s laws are just and perfectly fit to be implemented.
Abu Shurayh al-Khuzaa’i said: The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Whoever is killed or is wounded, has the choice of three things, and if he wants the fourth then restrain him. He may kill (the killer), or forgive him, or take the diyah (blood money).” Narrated by Abu Dawood.