'Light' in the Bible

This is the message that we have heard from him and declare to you: God is light, and in him there is no darkness none at all!

But if we keep living in the light as he himself is in the light, we have fellowship with one another, and the blood of Jesus his Son cleanses us from all sin.

On the other hand, I am writing to you a new commandment that is truly in him and in you. For the darkness is fading away, and the true light is already shining.

The person who says that he is in the light but hates his brother is still in the darkness.

The person who loves his brother abides in the light, and there is no reason for him to stumble.