What is a Prophet?

In this series, Pastor Bill King, looks "up into the attic" for the book of Haggai, "a forgotten treasure".In this first part we discover what this book is about, and why it is relevant for us today.What was the call, character, and expectation of a prophet in the old covenant? Is this valuable to us today? Has the ministry of prophecy ceased today? If not, what's the difference between an old covenant prophet and a new covenant prophet? What use might the spiritual gift of prophecy have for us? And should we encourage it?