A maternal uncle of mine called AbuBurdah sacrificed before the prayer (for 'Id). The Messenger of Allah (ﷺ) said: Your goat is meant for flesh. He said: Messenger of Allah, I have a domestic kid with me. He said: Sacrifice it, but it is not valid for any man other than you.
Sunan Abi Dawud Book 16, Hadith 14
← Previous Hadith The Messenger of Allah (ﷺ) delivered a sermon to us on the day of sacrifice after the prayer. He said: If anyone prays like our prayer, and sacrifices like our sacrifice, his sacrifice is all right. If anyone sacrifices before the prayer (for 'Id), that is goat meant for flesh. Abu Burdah b. Niyar stood up and said: Messenger of Allah, I swear by Allah, I sacrificed before I went for prayer. I thought it was the day of eating and drinking; so I made haste, and ate myself, and supplied flesh to my family and neighbors. The Messenger of Allah (ﷺ) said: That is a goat meant for eating flesh. He said: I have a kid (of less than a year) which is better than two goats meant for flesh. Will it be valid from me ? He said: Yes, but it will not be valid for anyone after you.

Sunan Abi Dawud Book 16, Hadith 13 Next Hadith → I asked al-Bara' ibn Azib: What should be avoided in sacrificial animals? He said: The Messenger of Allah (ﷺ) stood among us, and my fingers are smaller than his fingers, and my fingertips are smaller than his fingertips. He said (pointing with his fingers): Four (types of animals) should be avoided in sacrifice: A One-eyed animal which has obviously lost the sight of one eye, a sick animal which is obviously sick, a lame animal which obviously limps and an animal with a broken leg with no marrow. I also detest an animal which has defective teeth. He said: Leave what you detest, but do not make it illegal for anyone.

Abu Dawud said: (By a lean animal mean) and animal which has no marrow.

Sunan Abi Dawud Book 16, Hadith 15