Some have an additional custom to cover all pictures of people.[14]:p.54 (3:37), p.179 (16:4)[24]:pp.229–230 One reason, which is linked to the covering of mirrors (and, by some, all pictures of people too) is that prayer services are held in the house of mourning, if a quorum can be gathered, and "Jewish law clearly states that one may not worship an image or standing directly in front of one .. picture .. mirror."[3]:p.104