In ancient Egyptian religion, Ammut (also spelled Ammit and Ahemait, meaning Devourer or Soul Eater) was a female demon with a body that was part lion, hippopotamu and crocodile—the three largest "man-eating" animals known to ancient Egyptians. A funerary deity, her titles included "Devourer of the Dead", "Eater of Hearts", and "Great of Death".
Ammut lived near the scales of justice in Duat, the Egyptian underworld. In the Hall of Two Truths, Anubis weighed the heart of a person against Ma'at, the goddess of truth, who was sometimes depicted symbolically as an ostrich feather. If the heart was judged to be not pure, Ammut would devour it, and the person undergoing judgement was not allowed to continue their voyage towards Osiris and immortality. Once Ammut swallowed the heart, the soul was believed to become restless forever; this was called "to die a second time". Ammut was also sometimes said to stand by a lake of fire. In some traditions, the unworthy hearts were cast into the fiery lake to be destroyed. Some scholars believe Ammut and the lake represent the same concept of destruction.
Ammut was not worshipped, and was never regarded as a goddess; instead she embodied all that the Egyptians feared, threatening to bind them to eternal restlessness if they did not follow the principle of Ma'at.
Ammut has been linked with the goddess Tawaret, who has a similar physical appearance and, as a companion of Bes, also protected others from evil. Other authors have noted that Ammut's lion characteristics, and the lake of fire, may be pointers to a connection with the goddess Sekhmet. The relation to afterlife punishment and lake of fire location are also shared with the baboon deity Babi.