Joel 2:14

"Who knoweth whether he will not turn and repent, and leave a blessing behind him, even a meal-offering and a drink-offering unto Jehovah your God?

"Who knoweth ..." This was exactly the response of the people of Nineveh to the preaching of Jonah. They said: "Who knoweth whether God will not turn and repent, and turn away from his fierce anger, that we perish not?" (Jonah 3:9). This very likely indicates knowledge on the part of the Ninevites of this very passage in Joel; because all of the ancient Gentile nations were fully aware of God's special dealings with Israel, of his bringing them up out of Egypt; and they had, perhaps, also a knowledge of what their prophets had said. It is very difficult to believe that the Ninevites would have made exactly this response without a prior knowledge of Joel; a fact that advocates of a post-exilic date of Joel cannot explain at all.