Musannaf Ibn Abi Shayba 13:2180

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Sufyan narrated to us, from Ma’mar, from al-Zuhri, from ‘Umar, regarding a man who gifted an animal to a man, and it gave birth: He said: He has the right to take back its value on the day he gifted it.