أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، عَنِ ابْنِ أَبِي عَدِيٍّ، عَنْ خَالِدٍ، عَنِ الْقَاسِمِ، عَنْ عُقْبَةَ بْنِ أَوْسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ أَلاَ إِنَّ قَتِيلَ الْخَطَإِ قَتِيلَ السَّوْطِ وَالْعَصَا فِيهِ مِائَةٌ مِنَ الإِبِلِ مُغَلَّظَةٌ أَرْبَعُونَ مِنْهَا فِي بُطُونِهَا أَوْلاَدُهَا ‏"‏ ‏.‏

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." Translation Not Available

Book Ref: Sunan An Nisai Book 45 Hadith 4795
Web Ref:  Sunan An Nisai Vol 5 Book 45 Hadith 4799