The New Testament prophetic gift (Rom. 12:6; 1 Cor. 12:10) primarily has to do with declaration, not revelation. The New Testament prophet “speaks to men for edification and exhortation and comfort” (1 Cor. 14:3). He is a preacher, not a source of ongoing revelation. His task is one of forth-telling, not foretelling. That is, he proclaims already revealed truth; he is not generally a conduit for new revelation… This revelatory aspect of prophecy was unique to the apostolic era.
John MacArthur