14 Do not be unequally yoked with unbelievers. For what partnership has righteousness with lawlessness? Or what fellowship has light with darkness? 15 What accord has Christ with Belial? Or what portion does a believer share with an unbeliever? 16 What agreement has the temple of God with idols? For we are the temple of the living God; as God said,
“I will make my dwelling among them and walk among them,
and I will be their God,
and they shall be my people.
17 Therefore go out from their midst,
and be separate from them, says the Lord,
and touch no unclean thing;
then I will welcome you,
18 and I will be a father to you,
and you shall be sons and daughters to me,
says the Lord Almighty.”
7 Since we have these promises, beloved, let us cleanse ourselves from every defilement of body and spirit, bringing holiness to completion in the fear of God.
2 Corinthians 6:14-7:1
The critical and recurring problem across the testaments is the fact that God’s chosen people often flirt with the world. In this passage Paul cited from many different Old Testament verses to make a point. He wanted to point out the desire of the true God in taking up Israel as His own and as His alone, and the fact that actually God’s chosen people belongs to God as children of God that is holy (separate) from the world. Verse 16 “I will make my dwelling among them and walk among them” is cited from Leviticus 26:12 and Exodus 29:45. The next clause “and I will be their God, and they shall be my people” is cited from Exodus 6:7, Jeremiah 31:33, and Ezekiel 11:20. Verse 17 “go out from their midst, and be separate from them, says the Lord, and touch no unclean thing; then I will welcome you” is cited from Isaiah 52:11. Verse 18 “and I will be a father to you, and you shall be sons and daughters to me, says the Lord Almighty.” is cited from Exodus 4:22, 2 Samuel 7:8 & 14, Isaiah 43:6, Jeremiah 31:9, and Hosea 1:10. This point Paul made aimed at the principle conduct they ought to do as God’s people, in which God’s people ought to separate themselves qualitatively from the world. This means that God’s people can’t and mustn’t adopt the way of the world.