Sunan Abi Dawud 3591
سنن أبي داود#3591Da'ifNarrated Abdullah ibn Abbas: When this verse was revealed: "If they do come to thee, either judge between them, or decline to interfere....If thou judge, judge in equity between them." Banu an-Nadir used to pay half blood-money if they killed any-one from Banu Qurayzah. When Banu Qurayzah killed anyone from Banu an-Nadir, they would pay full blood-money. So the Messenger of Allah (ﷺ) made it equal between them
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan Sahih Isnaad
Muhammad Muhyi Al-Din Abdul HamidHasan Sahih Isnaad
Zubair Ali ZaiDaif
In-book reference: 25:21