As regards the Bible, a prophet is a person who proclaims or declares. A prophet declared God’s will to those around, and part of that declaration included advice about events that would happen in the future.
There are many Bible prophets, and there is a whole section in the Bible titled the “Major Prophets”, comprising the Bible books Isaiah to Daniel; then the “Minor Prophets” comprising the Bible books Hosea to Malachi (in the Old Testament), and the book of Revelation in the New. As well, scattered through the other books, there are other prophecies.
The credibility, probably on this rather than any other factor, stands or falls on whether Bible prophecies as far as they predict future events, are reliable. All Bible prophecies concerning the past have indeed been fulfilled to the letter, and this gives us every confidence that prophecies about events that are yet still future to our time will be fulfilled as well. The inherent danger of Bible prophecy, however, is that we need to make certain of our interpretation of them, otherwise we will be doomed to disappointment. Such disappointment may severely damage our faith. Many people in different denominations or sects have made what can only be described as “big fails” in making faulty predictions of their own, outside of Scripture warrant, despite the fact that they have proclaimed that they were based on the Bible.
Notable examples of fulfilled prophecy include predictions as to the fate of large cities such as Babylon, Tyre and Nineveh. They also contain predictions about individual people, such as Jesus. They also include prophecies about nations, particularly Israel, and these prophecies remain significant, both fulfilled and as yet unfulfilled, right up to the present day.
The doom of Babylon, for example, was predicted in Isaiah (refer chapter 13, verses 19-21). In the 6th Century BC the fate of Tyre was predicted (see Ezekiel 26:3-14 and 19). These prophecies came true in later years, just as predicted. In the 7th Century BC the fall of Nineveh was predicted by both Nahum and Zephaniah. These dire predictions also came to pass. There are also something like 330 predictions concerning Jesus in the Old Testament, which were all fulfilled by him. Similarly, there have been many fulfilled prophecies concerning the nation of Israel (Deuteronomy 28:64-68, Isaiah 43:5,6 and Jeremiah 29:14 are but three examples).
The odds of all these prophecies (a number of them would have appeared totally ridiculous at the time they were given) being fulfilled, put them (even just one, let alone all of them combined) simply beyond the ability of mere humans to have predicted, without Divine guidance. Sceptics are left without a case. Fulfilled prophecy provides undeniable evidence that the Bible is no mere ordinary book, but indeed is written with far more than human knowledge.