From Sahih Muslim (Hadith 4393):
Al-Mughira b. Shu'ba reported that a woman struck her co-wife with a tent-pole and she was pregnant and she killed her. One of them belonged to the tribe of Lihyan. Allah's Messenger (ﷺ) made the relatives of the murderer responsible for the payment of blood-wit on her behalf, and fixed a slave or a female slave as the indemnity for what was in her womb. One of the persons amongst the relatives of the murderer said:Should we pay indemnity for one who, neither ate, nor drank, nor made any noise, who was just like a nonentity? Thereupon Allah's Messenger (ﷺ) remarked: He speaks rhymed phrases like the people of the desert. He did impose indemnity upon them
Reference: Muslim 4393