Pastor Allen's sermon this week explores the distinction between Old Testament prophets and New Testament apostles, highlighting how God communicated His messages through them. It delves into the nature of prophecy in biblical times, explaining the infallibility of Old Testament prophets who received God's words directly and contrasted them with the New Testament prophets who express divine revelations in their own words. The sermon also discusses the transition from prophets to apostles, emphasizing that New Testament apostles held an equivalent role, ensuring the inerrancy and inspiration of Scripture.