"There were (the two tribes of) Quraizah and An-Nadir, and An-Nadir was nobler than Quraiaah. If a man of Quraizah Killed a man of An-Nadir, he would be killed in return, but if a man of An-Nadir killed a man of Quraizah, he would pay a Diyah of one hundred Wasqs of dates. When An-Nadir killed a man of Quraizah, and they said: 'Hand him over to us and we will kill him.' They said: 'Between us and you (as judge) is the Prophet.' So they came to him, then the following was revealed: "And if you judge, judge with justice between them."
Sunan an-Nasa'i Book 45, Hadith 27
← Previous Hadith "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 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."'

Sunan an-Nasa'i Book 45, Hadith 26 Next Hadith → "Either judge between them, or turn away from them. If you turn away from then up to: those who act justly." - were revealed concerning the matter of blood money between An-Nadir and Quraizah. That was because the slain of An-Nadir were of noble status, so the blood money would be paid in full for them, but for Banu Quraizah only half of the blood money would be paid. They referred the matter to the Messenger of Allah for judgment, then Allah, the Mighty and Sublime, revealed that concerning them, so the Messenger of Allah told them to do the right thing and he made the blood money equal.

Sunan an-Nasa'i Book 45, Hadith 28