Genesis 15:14-17

Genesis 15:14-17. And also that nation, whom they shall serve, will I judge: and afterward shall they come out with great substance. And thou shalt go to thy fathers in peace; thou shalt be buried in a good old age. But in the fourth generation they shall come hither again: for the iniquity of the Amorites is not yet full. And it came to pass, that, when the sun went down, and it was dark, behold a smoking furnace, and a burning lamp that passed between those pieces.

True emblems of the Church of God with her smoke and her light, her trying affliction, yet the grace by which she still keeps burning and shining in the world.