Zayd bin Wahb al-Juhani (may Allah have mercy on him) said: A man killed his wife; the woman's three brothers sought retribution, and the case came before Sayyiduna Umar (may Allah be pleased with him). One brother pardoned, so he (may Allah be pleased with him) said to the remaining two: Take two-thirds of the blood money; there is now no way to kill him.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 16073