Salaat behind a beard trimmer

Fataawa Rahimiyyah Vol 10 pg 320

Question: What is the ruling pertaining to a Haafiz who trims his beard, who leads the salaat?

Answer: The mas’ala is clear. According to all four Math’habs it is Haraam to trim the beard less than a fist. Reading Salaat behind such a person is Makrooh Tahrimi-Haraam and the person is a Faasiq.

Fataawa Rahimiyyah Vol 10 pg 123