Egyptian Book of the Dead
Chapter XXXIII
This chapter is often found in coffins. There is a chapter much resembling it in the tomb of Horhotep (line 364), at least as regards the opening words. It addresses Rerek and tells him that Shu and another deity are coming, and that the speaker is Horus. No allusion, however, is made to the dead rat and cat. These typify the impurities and abominations to which the damned are liable in the world to come