Traditionally, by default, firstborn sons are obligated to assist in the Temple in Jerusalem. As there is currently no Temple, this requirement is symbolic, but it is traditional to 'redeem' such people from their obligations if possible. Children in priestly families (kohanim, singular kohen, descendants of Moses's brother Aaron) and Levite families (descendants of Levi) cannot be redeemed from service. Traditionally, the child's father pays a kohen five silver coins in exchange for the child's freedom, shortly after the child becomes one month old. Blessings and a meal accompany the ritual.