2 Corinthians 6:14-7:1

2 Corinthians 6:14-7:1

New International Version (NIV)

¹⁴ Do not be yoked together with unbelievers. For what do righteousness and wickedness have in common? Or what fellowship can light have with darkness? ¹⁵ What harmony is there between Christ and Belial? Or what does a believer have in common with an unbeliever? ¹⁶ What agreement is there between the temple of God and idols? 

A yoke was put on two oxen so they could pull a cart or perhaps a plow together as a team.  As a Christian I have different values than non-Christians.  Therefore I should not enter into any binding relationship with them.  Marriage for example or perhaps business together.  These are all places where my standards in Christ will be higher than my non-Christian counterpart.

For we are the temple of the living God. As God has said:

“I will live with them
    and walk among them,
and I will be their God,
    and they will be my people.”

¹⁷ Therefore,

“Come out from them
    and be separate,
says the Lord.
Touch no unclean thing,
    and I will receive you.”

¹⁸ And,

“I will be a Father to you,
    and you will be my sons and daughters,
says the Lord Almighty.”

7 Therefore, since we have these promises, dear friends, let us purify ourselves from everything that contaminates body and spirit, perfecting holiness out of reverence for God.

These verses are NOT saying I can't have unsaved friends.  They are not saying I am to ignore or not speak to unbelievers.  They are saying I am to be different.  God has promised fellowship with me if I chose to walk with him.  My life is to change the world through Christ.