Abu Dawood

Qurayzah and Nadir (were two Jewish tribes). An-Nadir were nobler than Qurayzah. When a man of Qurayzah killed a man of an-Nadir, he would be killed. But if a man of an-Nadir killed a man of Qurayzah, a hundred wasq of dates would be paid as blood-money. When Prophethood was bestowed upon the Prophet (ﷺ), a man of an-Nadir killed a man of Qurayzah.

They said: Give him to us, we shall kill him. They replied: We have the Prophet (ﷺ) between you and us. So they came to him.

Thereupon the following verse was revealed: "If you judge, judge in equity between them." "In equity" means life for a life.

The following verse was then revealed: "Do they seek of a judgment of (the days) ignorance?"

Abu Dawud said: Quraizah and al-Nadir were the descendants of Harun the Prophet (ﷺ)

I went to the Prophet (ﷺ) with my father. The Messenger of Allah (ﷺ) then asked my father: Is this your son? He replied: Yes, by the Lord of the Ka'bah. He again said: Is it true? He said: I bear witness to it. The Messenger of Allah (ﷺ) then smiled for my resemblance with my father, and for the fact that my father took an oath upon me. He then said: He will not bring evil on you, nor will you bring evil on him. The Messenger of Allah (ﷺ) recited the verse: "No bearer of burdens can bear the burden of another."

The Prophet (ﷺ) said: If a relative of anyone is killed, or if he suffers khabl, which means a wound, he may choose one of the three things: he may retaliate, or forgive, or receive compensation. But if he wishes a fourth (i.e. something more), hold his hands. After this whoever exceeds the limits shall be in grave penalty.

I never saw the Messenger of Allah (ﷺ) that some dispute which involved retaliation was brought to him but he commanded regarding it for remission.

A man was killed in the lifetime of the Prophet (ﷺ). The matter was brought to the Prophet (ﷺ). He entrusted him to the legal guardian of the slain. The slayer said: Messenger of Allah, I swear by Allah, I did not intend to kill him. The Messenger of Allah (ﷺ) said to the legal guardian: Now if he is true and you kill him, you will enter Hell-fire. So he let him go. His hands were tied with a strap. He came out pulling his strap. Hence he was called Dhu an-Nis'ah (possessor of strap).

I was with the Prophet (ﷺ) when a man who was a murderer and had a strap round his neck was brought to him.

He then called the legal guardian of the victim and asked him: Do you forgive him?

He said: No. He asked: Will you accept the blood-money? He said: No. He asked: Will you kill him? He said: Yes. He said: Take him. When he turned his back, he said: Do you forgive him? He said: No. He said: Will you accept the blood-money? He said: No. He said: Will you kill him? He said: Yes. He said: Take him. After repeating all this a fourth time, he said: If you forgive him, he will bear the burden of his own sin and the sin of the victim. He then forgave him. He (the narrator) said: I saw him pulling the strap.

The tradition mentioned above has also been transmitted by 'Alqamah b. Wa'il through a different chain of narrators and to the same effect.