John 8:12
So, Jesus spoke to them again [i.e., to the Jewish authorities. See 7:45], saying, "I am the light of the world. The person who becomes my follower will never live in [spiritual] darkness, but have the light of [i.e., for his] life [i.e., followers of Jesus will not live in error and sin but in truth and righteousness]."
John 12:46
I have come into the world to be a light [to it], so that whoever believes in me would not have to remain in [spiritual] darkness.
Revelation 21:23
And the city does not need the sun or the moon to illuminate it, for the splendor of God provides the light for it, and its lamp is the Lamb.