Abu Salamah and Sulaiman bin Yasar narrated from one of the Companions of the Messenger of Allah, one of the Ansar, that: the Messenger or Allah approved of Qasamah as it had been during the Jahiliyyah.

It was narrated that Ibn Al-Musayyab said: "Qasamah existed during the Jahiliyyah, then the Messenger of Allah (ﷺ) confirmed it in the case of an Ansari who was found slain in the dry well of the jews, and Ansar said: "The Jews kill our companion."'

It was narrated from Sa'eed bin 'Ubaid At-Ta'l from Bushair bin Yasar who said: "A man from among the Ansar who was called Sahl bin Abi Hathmah told him that some of his people went to Khaibar, where they went their separate ways. Then they found one of their numbers slain. They said to those in whose land they found him: 'You killed our companion!' They said: 'We did not kill him and we do not know who killed him.' They went to the prophet of Allah and said: 'O Prophet of Allah, we went to Khaibar and we found one of our number slain.' The Messenger of Allah (ﷺ) said: 'Let the elders speak first.' And he said to them: 'Bring proof of the one whom you suspect killed him.' They said: 'We do not have any proof.' He said: "Then let them swear an oath to you.' They said" 'We will not accept the oath of the Jews.' The Messenger of Allah (ﷺ) did not want his blood to have been shed with no Justice done, so he paid a Diyah of one hundred camels from the Sadaqah." 'Amr bin Shu'aib differed with them.

It was narrated from 'Abdullah that the Messenger of Allah (ﷺ) said: "It is not permissible to shed the blood of a Muslim except in one of three cases: A soul for a soul, a adulterer who has been married, and one who separates leaving his religion."

It was narrated from Ans bin Malik that a man brought the killer of his kinsman to the Messenger of Allah (ﷺ) and the Prophet (ﷺ) said: "Forgive him." But he refused. He said: "Take the Diyah," but he refused. He said: "Go and kill him then, for you are just like him." So he went away, but some people caught up with the man and told him that the Messenger of Allah (ﷺ) had said: "Messenger of Allah had said: "Kill him for you are just like him." So he let him go, and the man passed by me dragging his string.

It was narrated from 'Abdullah bin Buraidah, from the father, that a man came to the Prophet (ﷺ) and said: "This man killed my brother." He said: "Go and kill him as he killed your brother." The man said to him: "Fear Allah and let me go, for that will bring you a greater reward and will be better for you and your brother on the Day of Resurrection." So he let him go. The Prophet (ﷺ) was told about that, so he asked him about it, and he told him what he had said. He said: "Pardoning him would be better for you than what he would have done for you on the Day of Resurrection when he said: 'O Lord, ask him why he killed me."'

It was narrated that Qais bin 'Ubad said: "Al-Ashtar and I went to 'Ali, may Allah be pleased with him, and said: Did the Prophet (ﷺ) of Allah tell you anything that he did not tell to all the people?' He said: 'No, except what is in this letter of mine.' He brought out a letter from the sheath of his sword and it said therein: "The lives of the believers are equal in value, and they are one against others, and they hasten to support the asylum granted by the least of them. But no believer may be killed in return for a disbeliever, nor one with a covenant while his convenant is in effect. Whoever commits an offense then the blame is on himself, and whoever gives sanctuary to an offender, then upon him will be the curse of Allah, the angels and all the people."

It was narrated from 'Ali, may Allah be please with him that the Prophet (ﷺ) said: "The lives of the believers are equal in value, and they are one against others, and they hasten to support the asylum granted by the least of them. But no believer may be killed in return for a disbeliever, nor one with a covenant while his covenant is in effect."

It was narrated from Samurah that the Prophet (ﷺ) said: "Whoever kills his slave, we will kill him, and whoever mutilates his slave, we will mutilate him."

It was narrated that Samurah said: "The Prophet (ﷺ) said: 'Whoever kills his slave, we will kill him, and whoever mutilates his slave, we will mutilate him."'

It was narrated from Anas that: a Jew killed a young girl for her jewelry, so the Messenger of Allah (ﷺ) killed him in retaliation for her.

It was narrated from 'Aishah, the Mother of the Believers, that the Messenger of Allah (ﷺ) said: "It is not permissible to kill a Muslim except in one of three cases: A adulterer who has been married, who is to be stoned; a man who kills a Muslim deliberately; and a man who leaves Islam and wages war against Allah, the Mighty and Sublime, and His Messenger, who is to be killed, crucified or banished from the land."

It was narrataed from Al-Ashtar that he said to 'Ali: "What the people have been hearing from you has become widespread. If the Messenger of Allah (ﷺ) told you anything, then tell us," He said: "The Messenger of Allah (ﷺ) did not tell me anything that he did not tell the people, except that in the sheath of my sword there is a sheet, in which it says: 'The lives of the believers are equal in value, and they hasten to support the asylum granted by the least of them. But no believer may be killed in return for a disbeliever, nor one with a covenant while his covenant is in effect."' It is an abridgement of it.

It was narrated from 'Imran bin Hussain that: a slave belonging to some poor people cut off the ear of a slave belonging to some rich people. They came to the Prophet (ﷺ) but he did not give them anything.

It was narrated from Anas that: the Messenger of Allah (ﷺ) ruled that Qisas should be given for a tooth. The Messenger of Allah (ﷺ) said: "The Messenger of Allah (ﷺ) said: "What Allah has decreed is retaliation."

It was narrated from Samurah that the Messenger of Allah (ﷺ) said: "Whoever kills his slave, we will kill him, and whoever mutilates his slave, we will mutilate him."

Anas narrated that: his paternal aunt broke the front tooth of a girl and the Prophet (ﷺ) of Allah decreed retaliation. Her brother, Anas bin An-Nadr, said: "Will you break the front tooth of so and so? No, by the One Who sent you with the truth, the front tooth of so and so will not be broken!" Before that, they had asked her family for forgiveness and blood money. When her brother - who was the paternal uncle of Anas and was martyred at Uhud - swore that oath, the people agreed to forgive. The Prophet (ﷺ) said: "There are among the slaves of Allah who, if they swear by Allah, Allah fulfills their oath."

It was narrated that 'Imran bin Husain said: "Ya'la fought with a man, and one of them bit the other, who pulled his hand away from his mouth, and a front tooth fell out. They referred their dispute to the Messenger of Allah (ﷺ) and he said: 'Would one of you bite his brother as a stallion bites? There is no Diyah for that."

It was narrated from 'Imran bin Husain that: a man bit another man in the forearm, and his front tooth fell out, so he went to the Prophet (ﷺ) and told him about that. He said: "Do you want to bite your brother's forearm as a stallion bites?" And he judged it to be invalid.

It was narrated from Ya'la bin Munyah that: he fought a man and one of them bit the other, who pulled his forearm away from his mouth, and a front tooth fell out. The matter was referred to the Prophet (ﷺ) and he said: "Would one of you bite his brother as a young camel bites?" And judged it to be invalid.