It is narrated from Sayyiduna Abu Shurayh al-Khuza'i (may Allah be pleased with him); he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever is afflicted by (the loss of) blood or by a wound is between one of three things, and if he intends a fourth thing, then seize his hand (to restrain him): either he takes retaliation, or he forgives, or he takes the blood money. So if he takes one of them and then transgresses after that, for him is the Fire, in which he will abide forever and ever."
Hadith Referenceالمعجم الكبير للطبراني / باب الهاء / 18717