When someone asked Imām Mālik about a person who calls another a donkey, and he replied that he should be punished. When the same questioner asked, “What if he calls him a horse?,” the Imām replied, “Then you should be punished.” (i.e. for asking such a question)

[from Shaykh Waleed Idrees’s commentary on Bakr Abu Zayd’s Book of Knowledge.]