Amr bin Shu'ayb (may Allah have mercy on him) says that Sayyiduna Umar (may Allah be pleased with him) said: I fear that someone will come after me who will destroy a man's blood money, so I state a word on this matter: upon the owner of camels are 100 camels, upon the owner of gold 1000 dinars, and upon the owner of silver 12000 dirhams.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16184