Sahih Muslim
The Book Pertaining to the Oath, for Establishing the Responsibility of Murders, Fighting, Requital and Blood-Wit (Kitab Al-Kitab Al-Qasama wal-Muharaba wal-Qisas wal-Diyat)
Book Number: 016 / Hadith Number: 4166
Abu Huraira reported that among two women of the tribe of Hudhail one flung a stone upon the other causing an abortion to her Allah's Apostle (may peace he upon him) gave judgment that a male or a female slave of best quality be given as compensation.