A man came to the Prophet ﷺ and said, "This man killed my brother."The Prophet ﷺ said, "Go and kill him just as he killed your brother."Then the accused man said to him, "Fear Allah and pardon me, for that will be greater in reward for you and better for you and your brother on the Day of Resurrection."So he let him go.The Prophet ﷺ was informed of this and asked him about it, and he told him what the man had said to him. The Prophet ﷺ reproached him and said, "Indeed, he was better than what he was about to do with you on the Day of Resurrection, when he would say, 'My Lord, ask this man why he killed me.'"
أخبرنا الحسن بن إسحق المروزي قال حدثني خالد بن خداش قال حدثنا حاتم بن إسمعيل عن بشير بن المهاجر
جاء إلى النبي ﷺ فقال إن هذا الرجل قتل أخي قال اذهب فاقتله كما قتل أخاك فقال له الرجل اتق الله واعف عني فإنه أعظم لأجرك وخير لك ولأخيك يوم القيامة قال فخلى عنه قال فأخبر النبي ﷺ فسأله فأخبره بما قال له قال فأعنفه أما إنه كان خيرا مما هو صانع بك يوم القيامة يقول يا رب سل هذا فيم قتلني
No references are available.
[Its isnad is hasan] It appears in Kubra, no. 6933. Bashir was deemed reliable by the majority, as mentioned in Tashil Hajah, no. 3781. His hadith has corroborating reports, including the previous hadith.