Mishkatul Masabih — Hadith #40189

He said, Once the Messenger of Allah (peace and blessings of Allah be upon him) asked to bring a horned donkey that walks in black, sleeps in black, sees in black, i.e. a donkey that has black legs, black belly and black eyes. Just such a dumba was brought for the sacrifice. then He (peace be upon him) said to Aisha (RA), O Aisha! take a knife Set it in stone. Aisha said, I did so. Then he (peace and blessings of Allah be upon him) took the knife in his hand and caught the dumbass. Then it He lay down on his side and said, "I begin in the name of Allah, O Allah! Accept this sacrifice on behalf of Muhammad, the family of Muhammad and the Ummah of Muhammad." Then he fed the people with this sacrifice gave (Muslim) [1]