Husayn bin 'Abdur Rahman al-Salmi حصين بن عبد الرحمن السلمي · The Book on Sacrifices

From his father that the Messenger of Allah (ﷺ) said: "I used to prohibit you from (eating) the meat of Sacrifice beyond three days so that those who have the ability would give to those who do not have it. So (now) eat as you like, feed others, and save from it."

That the Messenger of Allah (ﷺ) said: "For a boy, there is an 'Aqiqah. So spill blood for him and remove the harm from him."