'World' in the Bible

Who was marked out by God before the making of the world, but was caused to be seen in these last times for you,

My loved ones, I make this request with all my heart, that, as those for whom this world is a strange country, you will keep yourselves from the desires of the flesh which make war against the soul;

Do not give way to him but be strong in your faith, in the knowledge that your brothers who are in the world undergo the same troubles.