1 Thessalonians 4:6-8

6and not to overstep his brother and take advantage of him in this matter— because the Lord is the avenger in all these things, as we told you before and solemnly warned you.

7For God did not call us to impurity, but in holiness.

8Consequently, the one who rejects this is not rejecting man, but God, who gives His Ruach ha-Kodesh to you.