Musannaf Ibn Abi Shaybah

Hazrat Ata says that whoever has a worm come out from his anus must perform ablution.

Ibrahim says that ablution is not obligatory upon such a person.

Hasan says that if a worm comes out from a man's anus, he must perform ablution.

Hazrat Abu Alia says that if anything comes out from the upper half of a person's body, there is no ablution (wudu), and if anything comes out from the lower half, then ablution (wudu) is required.

Hazrat Hammad says that such a person will perform ablution.

Hazrat Musa bin Abdullah narrates that I asked Ibrahim, "A worm has come out from my anus, should I perform ablution?" He replied, "You do not need to perform ablution."