'World' in the Bible

religion pure and undefiled with the God and Father is this, to look after orphans and widows in their tribulation -- unspotted to keep himself from the world.

Hearken, my brethren beloved, did not God choose the poor of this world, rich in faith, and heirs of the reign that He promised to those loving Him?

and the tongue is a fire, the world of the unrighteousness, so the tongue is set in our members, which is spotting our whole body, and is setting on fire the course of nature, and is set on fire by the gehenna.

Adulterers and adulteresses! have ye not known that friendship of the world is enmity with God? whoever, then, may counsel to be a friend of the world, an enemy of God he is set.