سنن نسائی · Hadith 4244

It was narrated that Nubaishah said: “A man called out while he was in Mina and said: ‘Messenger of Allah صلی اللہ علیہ وآلہ وسلم, we used to sacrifice the ‘Atirah during the Jahili)yah in Rajab; what do you command us to do?’ He said: ‘Sacrifice during whatever month it is, do good for the sake of Allah, the Mighty and Sublime, and feed (the poor).’ They said: ‘Messenger of Allah صلی اللہ علیہ وآلہ وسلم, we used to sacrifice the Fara’ during the Jahili)yah; what do you command us to do?’ He said: ‘For every flock of grazing animals, feed the firstborn as you feed the rest of your flock until it reaches an age where it could be used to carry loads, then sacrifice it, and give its meat in charity.” (Sahih)