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, the one entitled has the choice of one of three things: either he takes retaliation, or he forgives, or he takes the blood money. If he intends a fourth thing, then seize his hand (to restrain him). So if he chooses one of these things and then transgresses toward the fourth, he will be in the Fire, abiding in it forever and ever."
Hadith Referenceالمعجم الكبير للطبراني / باب الهاء / 18716