al-Laith bin Sa'd الليث بن سعد · The Book of ad-Dahaya (Sacrifices)

"Whoever sees the new crescent of Dhul-Hijjah and wants to offer a sacrifice, let him not remove any of his hair or nails until he has offered the sacrifice."

"IU said to Al-Bara bin Azib: 'Tell me of the sacrificial animals that the Messenger of Allah disliked or forbade, He said: The Messenger of Allah stood up, and my hands are shorter than his, and he said: "There are four that will not do as sacrifices: the animals that clearly has one bad eye: the sick animals that is obviously sick; the lame animal with an obvious limp; and the animal that is so emaciated that it is as…

"I saw him: - meaning the Prophet - "slaughtering them with his own hand, and placing his foot on their sides, pronouncing the name of Allah and saying: 'Allah Akbar,' (sacrificing) two horned, Amlah rams." (Sahih )