Orthodox priests who serve in parishes are usually married. They must marry prior to their ordination. If they marry after they are ordained they are not permitted to continue performing sacraments. If their wife dies, they are forbidden to remarry; if they do, they may no longer serve as a priest. A married man may be ordained as a priest or deacon. However, a priest or deacon is not permitted to enter into matrimony after ordination. Bishops must always be monks and are thus celibate. However, if a married priest is widowed, he may receive monastic tonsure and thus become eligible for the episcopate.