The Egyptians were the first known peoples to discover and use leaven, which they credited to their gods. Later, the Israelites in this culture were living a bitter life as slaves to the Egyptians. Then the unexpected happened to the Israelites, the people trapped in the lowest levels of this society - they were rescued and brought into a new society with a new structure and a new Leader. They symbol of this new culture was a very different bread - unleavened bread. This message was given on the First Day of Unleavened Bread.