1. The method of slaughtering an animal is that the animal should be placed on the ground with the face towards the qiblah. The person should take a sharp knife, recite Bismillahi Allahu Akbar and cut the neck of the animal in such a manner that four veins (or passage ways) are cut off. They are: the air passage, the gullet, and the two jugular veins which are on either side of the gullet and the air passage. If only three out of these four are cut, the slaughter will be valid and the animal will be halaal. If only two of the four are cut, the animal will be considered to be dead and it will not be permissible to consume the meat of such an animal.

2. At the time of slaughtering the person intentionally did not take the name of Allah Ta’ala. The animal will be considered to be dead and it will be haraam to consume it. But if a person forgets to take the name of Allah Ta’ala, the animal will be halaal.

3. It is makruh to slaughter an animal with a blunt knife as this causes much suffering to the animal. It is also makruh to begin skinning, cutting, breaking the hands and feet of the animal before it can become cold (meaning, before it can become lifeless). Similarly, it is makruh to continue cutting the animal’s neck after having cut the four passage ways.

4. At the time of slaughtering a fowl, it’s entire neck got cut off. It is permissible to eat such a fowl, and not makruh. However, it is makruh to slaughter the fowl in such a manner, although consuming it is not makruh.

5. Slaughtering of an animal by a Muslim is permissible under any condition. This is irrespective of whether the Muslim is a male, a female, in a state of purity or in a state of impurity. In all conditions, an animal slaughtered by a Muslim is halaal. An animal slaughtered by a non-Muslim is haraam.

6. It is permissible to slaughter an animal with any sharp object such as a sharp stone, a sharp cane, a sharp bamboo, etc.

7. The condition of slaughtering animal is permissible to those persons who have 87.345gms gold or 605.592gms silver or equialent cash (equal to price of any one of gold or silver) during the days of Eid-ul-Azha.

Hadiths About Slaughtering Animals

Narrated Rafi bin Khadij: We were with the Prophet in Dhul-Hulaifa and there the people were struck with severe hunger. Then we got camels and sheep as war booty (and slaughtered them). The Prophet was behind all the people. The people hurried and fixed the cooking pots (for cooking) but the Prophet came there and ordered that the cooking pots be turned upside down. Then he distributed the animals, regarding ten sheep as equal to one camel. One of the camels ran away and there were a few horses with the people. They chased the camel but they got tired, whereupon a man shot it with an arrow whereby Allah stopped it. The Prophet said, “Among these animals some are as wild as wild beasts, so if one of them runs away from you, treat it in this way.” I said. “We hope, or we are afraid that tomorrow we will meet the enemy and we have no knives, shall we slaughter (our animals) with canes?” The Prophet said, “If the killing tool causes blood to gush out and if Allah’s Name is mentioned, eat (of the slaughterer animal). But do not slaughter with a tooth or a nail. I am telling you why: A tooth is a bone, and the nail is the knife of Ethiopians.”  (Book #67, Hadith #406)

Narrated ‘Abdullah: Allah’s Apostle said that he met Zaid bin ‘Amr Nufail at a place near Baldah and this had happened before Allah’s Apostle received the Divine Inspiration. Allah’s Apostle presented a dish of meat (that had been offered to him by the pagans) to Zaid bin ‘Amr, but Zaid refused to eat of it and then said (to the pagans), “I do not eat of what you slaughter on your stonealtars (Ansabs) nor do I eat except that on which Allah’s Name has been mentioned on slaughtering.”  (Book #67, Hadith #407)

Invite (mankind, O Muhammad ) to the Way of your Lord (i.e. Islam) with wisdom (i.e. with the Divine Inspiration and the Qur’an) and fair preaching, and argue with them in a way that is better. Truly, your Lord knows best who has gone astray from His Path, and He is the Best Aware of those who are guided. (Holy Quran-16:125)

And who is better in speech than he who [says: “My Lord is Allah (believes in His Oneness),” and then stands straight (acts upon His Order), and] invites (men) to Allah’s (Islamic Monotheism), and does righteous deeds, and says: “I am one of the Muslims.” (Holy Quran-41:33)

The prophet (peace and blessings of Allah be upon him) said: “By Allah, if Allah guides one person by you, it is better for you than the best types of camels.” [al-Bukhaaree, Muslim]

The prophet (peace and blessings of Allah be upon him)  also said, “Whoever calls to guidance will have a reward similar to the reward of the one who follows him, without the reward of either of them being lessened at all.”
[Muslim, Ahmad, Aboo Daawood, an-Nasaa’ee, at-Tirmidhee, Ibn Maajah]