Narrated Umm Kurz al-Ka'biyyah: I heard the Messenger of Allah (ﷺ) say: Two resembling sheep are to be sacrificed for a boy and one for a girl. AbuDawud said: I heard Ahmad (ibn Hanbal) say: The Arabic word mukafi'atani means equal (in age) or resembling each other

English translation · Sunan Abu Dawud