1 Corinthians 7:13

7:13 And if a woman has a husband who is not a believer and he is happy to live with her, she should not divorce him.

1 Corinthians 10:27

10:27 If an unbeliever invites you to dinner and you want to go, eat whatever is served without asking questions of conscience.

1 Corinthians 14:23

14:23 So if the whole church comes together and all speak in tongues, and unbelievers or uninformed people enter, will they not say that you have lost your minds?