Bible Verses About Warfare of Saints: The world

These things I have spoken unto you, that in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world.

For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, even our faith.

Who is he that overcometh the world, but he that believeth that Jesus is the Son of God?