Who is the light of the world?
John 9:5 While I am in the world, I am the light of the world.
Matt. 5:14 You are the light of the world.

So, who is the light of the world -- Jesus or his followers?

As Jesus' followers are the "body of Christ" on earth, the answer is obviously both. This is no whimsical distinction; it is a description fully in accord with Jewish sensibilities (and the OT concept of Israel as being a "light" to the nations, precisely because they carry God's message) and the imagery of "light" from God.