Exodus 23:14-17

All the male Israelites had to make a pilgrimage to the sanctuary (tabernacle) three times a year for the feasts of Unleavened Bread, Firstfruits (Weeks, Pentecost), and Ingathering (Booths, Tabernacles). Women and children would have normally accompanied the males. This requirement fostered the maintenance of the national and social unity of the 12 tribes as well as their spiritual unity.