Acts.14.2But the unbelieving Jews stirred up the Gentiles and poisoned their minds against the brothers.
1Cor.7.14For the unbelieving husband is made holy because of his wife, and the unbelieving wife is made holy because of her husband. Otherwise your children would be unclean, but as it is, they are holy.
1Cor.7.15But if the unbelieving partner separates, let it be so. In such cases the brother or sister is not enslaved. God has called you to peace.
Titus.1.15To the pure, all things are pure, but to the defiled and unbelieving, nothing is pure; but both their minds and their consciences are defiled.
Heb.3.12Take care, brothers, lest there be in any of you an evil, unbelieving heart, leading you to fall away from the living God.