Ab is the mythical month of
the Semites. 
On the twentieth of the month, crossing a river was said to
make you ill. 
According to ancient writings, a man would be troubled with
boils if he eats pig meat on the thirty-first day of Ab. 
The heart was also known as Ab in ancient Egypt. 
The preservation of the heart, which was the seat of the conscience,
was a crucial aspect of the mummification process. 
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