Shu'bah bin al-Hajjaj شعبة بن الحجاج · The Book on Sacrifices

"The Messenger of Allah (ﷺ) slaughtered two horned male sheep which were mostly white. He slaughtered them with his hand and mentioned Allah's Name, and he said 'Allahu Akbar', and put his foot on their side."

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."