2Cor 6:17 Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you, 18 And will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty. Who is Paul talking to in this passage? Who are they to come out from? How are they to be seperate? What is the unclean thing they aren't supposed to touch?