Sahih Bukhari

Narrated Al-Mughira bin Shu`ba:`Umar bin Al-Khattab asked (the people) about the Imlas of a woman, i.e., a woman who has an abortion because of having been beaten on her `Abdomen, saying, ""Who among you has heard anything about it from the Prophet?"" I said, ""I did.'' He said, ""What is that?"" I said, ""I heard the Prophet saying, ""Its Diya (blood money) is either a male or a female slave.' "" `Umar said, ""Do not leave till you present witness in support of your statement."" So I went out, and found Muhammad bin Maslama. I brought him, and he bore witness with me that he had heard the Prophet (ﷺ) saying, ""Its Diya (blood money) is either a male slave or a female slave