Do not be mismatched with unbelievers; for what do righteousness and lawlessness share together, or what does light have in common with darkness? 2 Corinthians 6

2 Corinthians 6:14-17:

¹⁴ Do not be mismatched [heterozugeo] with unbelievers; for what do righteousness and lawlessness share together, or what does light have in common with darkness? ¹⁵ Or what harmony does Christ have with Belial ["worthless or wicked" 1) a name of Satan], or what does a believer share with an unbeliever? ¹⁶ Or what agreement does the temple of God have with idols? For we are the temple of the living God; just as God said,

“I will dwell among them and walk among them;
And I will be their God, and they shall be My people.
¹⁷ Therefore, come out from their midst and be separate,” says the Lord. [Be separate. - JRD]
“And do not touch what is unclean;
And I will welcome you.

Heterozugeo means:

—Greek Word Study (Transliteration-Pronunciation Etymology & Grammar)

 1) to come under an unequal or different yoke, to be unequally yoked
    1a) to have fellowship with one who is not an equal: 2Cor 6:14,
        where the apostle is forbidding Christians to have intercourse
        with idolaters

SEE:

Separate Yourselves From Those Lacking Courage.