come out from among them

 Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness? And what concord hath Christ with Belial? or what part hath he that believeth with an infidel? And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people. 

Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you.

And will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty. 

2 Corinthians 6:14-19

Having therefore these promises, dearly beloved, let us cleanse ourselves from all filthiness of the flesh and spirit, perfecting holiness in the fear of God. 2 Corinthians 7:1

Behold, what manner of love the Father hath bestowed upon us, that we should be called the sons of God: therefore the world knoweth us not, because it knew him not. Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is.

 And every man that hath this hope in him purifieth himself, even as He is pure. 1 John 3:1-3

 The Lord hath made bare his holy arm in the eyes of all the nations; and all the ends of the earth shall see the salvation of our God. Depart ye, depart ye, go ye out from thence, touch no unclean thing; go ye out of the midst of her; be ye clean, that bear the vessels of the Lord. Isaiah 52:10-11

And I heard another voice from heaven, saying, Come out of her, my people, that ye be not partakers of her sins, and that ye receive not of her plagues. Revelation 18:4 

Herein is our love made perfect, that we may have boldness in the day of judgment: because as he is, so are we in this world. 1 John 4:17

Romans 12:2 And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.
conformed means Fashion alike, conform to same pattern, give same form with
Transformed means Change one's form, transformed in mind and heart
Renewing means renovation which makes a person different than in the past, renew qualitatively
Acceptable means well pleasing , strive to make our lives acceptable & well pleasing