'Light' in the Bible

Now this is the message we have heard from Him and declare to you: God is light, and there is absolutely no darkness in Him.

But if we walk 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.

Yet I am writing you a new command, which is true in Him and in you, because the darkness is passing away and the true light is already shining.

The one who says he is in the light but hates his brother is in the darkness until now.

The one who loves his brother remains in the light, and there is no cause for stumbling in him.