It was narrated from 'Uqbah bin 'Aws, that the Mssenger of Allah said: "Indeed the accidental killing, the killing with a whip or stick, for it (the Diyah) is one hundred camels - a severe penalty - of which forty should be (she-camels) with their young in their wombs"
Sahih LighairihiSahihHasanBook 45 · Hadith 90