al-Hasan al-Basri الحسن البصري · The Book on Sacrifices

That the Messenger of Allah (ﷺ) said: "A human does no action from the actions on the day of Nahr more beloved to Allah then spilling blood (of sacrificial animals). On the Day of Judgement, it will appear with its horns, and hair, and hooves, and indeed the blood will be accepted by Allah from where it is received before it even falls upon earth, so let your heart delight in it."

"The Muqabalah is the one whose ears have been severed, the Mudabarah is the one with the sides of its ears cut off, and the Sharqa' is one with its ears split, and the Khurqa' is the one whose ears have a hole pierced through them."