From Sahih Bukhari (Hadith 6904):
Narrated Abu Huraira:Two women from the tribe of Hudhail (fought with each other) and one of them threw (a stone at) the other, causing her to have a miscarriage and Allah's Messenger (ﷺ) gave his verdict that the killer (of the fetus) should give a male or female slave (as a Diya)
Reference: Bukhari 6904