It was narrated from Abdullah bin 'Amr that the Prophet ﷺ said:
“Killing by mistake that resembles intentionally, is killing with a whip or stick, for which the blood money is one hundred camels, of which forty should be pregnant she-camels in middle of their pregnancies, with their young in their wombs.”

حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ، وَمُحَمَّدُ بْنُ جَعْفَرٍ، قَالاَ حَدَّثَنَا شُعْبَةُ، عَنْ أَيُّوبَ، سَمِعْتُ الْقَاسِمَ بْنَ رَبِيعَةَ، عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو، عَنِ النَّبِيِّ ﷺ قَالَ " قَتِيلُ الْخَطَإِ شِبْهِ الْعَمْدِ قَتِيلُ السَّوْطِ وَالْعَصَا مِائَةٌ مِنَ الإِبِلِ أَرْبَعُونَ مِنْهَا خَلِفَةً فِي بُطُونِهَا أَوْلاَدُهَا " .