A Matter of Faith: Volunteering in a Religious Context

All faiths rely heavily on the goodwill of their followers to undertake work on behalf of the church/synagogue/mosque/congregation of both a spiritual and practical nature. Is this recognized as “volunteering” by those in leadership positions within their respective faiths?  How does service to the congregation relate to service done in the outside community under the sponsorship of the house of worship?  Where does service as an expression of faith end and volunteering begin? Is there a clear jumping off point either scripturally or pragmatically?