Sufyan bin 'Uyaynah سفيان بن عيينة · Sacrifice (Kitab Al-Dahaya)

A man called the Messenger of Allah (ﷺ): We used to sacrifice Atirah in pre-Islamic days during Rajab; so what do you command us? He said: Sacrifice for the sake of Allah in any month whatever; obey Allah, Most High, and feed(the people). He said: We used to sacrifice a Fara' in pre-Islamic days, so what do you command us? He said: On every pasturing animal there is a Fara' which is fed by your cattle till it becomes strong…