Abdullah bin Wahb عبد الله بن وهب بن مسلم القرشي · 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."

"The Messenger of Allah commanded us to examine the eyes and ears (of animals), and no0t to sacrifice and animals with its ears slit from the front, and animal with its ears slit form the back, a animal with its tail cut, nor an animals with a round hole in its ear."

"The Messenger of Allah said on the Day of Sacrifice:' Whoever slaughtered his sacrifice before the prayer, let him repeat it.' A man stood up and said: 'O Messenger of Allah, this is a day when people want to eat meat.' He mentioned that his neighbors were poor and it was as if the Messenger of Allah believed him. He said: 'I have a Jadh'ah that is dearer to me than tow sheep for meat.; So he granted him a…