The Sign of the Rainbow

The Lord hath set the bow in the cloud for a sign that while it shall be seen, seed time and harvest, summer and winter shall not fail; but when it shall disappear, woe to that generation, for behold the end cometh quickly. (Joseph Smith, History of The Church of Jesus Christ of Latter-day Saints, 7 Vols. 5:402)

I have asked of the Lord concerning His coming; and while asking the Lord, He gave a sign and said, "In the days of Noah I set a bow in the heavens as a sign and token that in any year that the bow should be seen the Lord would not come; but there should be seed time and harvest during that year: but whenever you see the bow withdrawn, it shall be a token that there shall be famine, pestilence, and great distress among the nations, and that the coming of the Messiah is not far distant." (Joseph Smith, History of The Church of Jesus Christ of Latter-day Saints, 7 Vols. 6:254)