Those who serve are to be treated fairly and with respect. Jesus Christ himself chose to be a servant and lays responsibility of service on those who follow.
Servants are to be treated fairly
See also
They are not to be exploited
They are to be paid fairly and promptly
Examples of servants treated unfairly
Jesus Christ as a servant
Believers follow Jesus Christ's example as servants
They are servants of Jesus Christ and his church
They work to please God
Christian workers should be paid honourably
God rewards his servants
Service of sin has its reward