The history of Jews is a history of vagrancy. As a branch of Semitic language family, they first appeared in the two river basins and later migrated to Egypt via Canaan. In the 3rd century BC/KLOC-,he left Egypt under the leadership of Moses and came to arid desert of sinai. After wandering in the Sinai Peninsula for a generation, they decided to return to "Canaan flowing with milk and honey". During this period, Jews also experienced the process from tribe to unified nation. At the same time, they gradually gave up nomadic social organizations and engaged in farming or urban occupations.