Sufyan bin Sa‘id Ath-Thawri سفيان الثوري · Sacrifice (Kitab Al-Dahaya)

The Messenger of Allah (ﷺ) distributed sacrificial animals among his Companions. He gave me a kid (of less than a year). I took it to him and said: This is a kid. He said: Sacrifice it. so I sacrificed it.

The Messenger of Allah (ﷺ) used to sacrifice goat out of every fifty goats. Abu Dawud said: Fara' means the first baby camel born (to the Arabs). They used to sacrifice it for their idols, and then eat it, and its skin was thrown on a tree. 'Atira was a sacrifice made during the first ten days of Rajab.

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.