John 12:31-36.
Now judgment is coming upon the world; now the prince of this world will be cast out. And I, when I am lifted up from the earth, will draw them all to myself. He said this to indicate the death he would die. Then the people answered him, We have heard in the law that Christ abideth for ever: and how sayest thou then that the Son of man must be lifted up? Who is this Son of Man? Then said Jesus unto them: The light is yet a little while with you. While ye have the light, walk, lest the darkness overtake you. He that walketh in darkness knoweth not whither he goeth. Believe in the light while you have it, so that you may be children of the light.