The phrase "prayer closet" refers to a quiet and private space where someone can pray and communicate with their religious beliefs or a higher power. Full definition
With this in mind, it is sometimes humorous to see some people's idea of prayer closets. (redeeminggod.com)
In my anger, hurt, and self - righteouness I attempted to lash back but when my eyes connected with his (in my prayer closet) I was humbled and laid prostrate before him. (nakedpastor.com)
Didn't HE instruct you that prayer was better done in private, in your prayer closet? (religion.blogs.cnn.com)