'Unbelievers' in the Bible

the lord of that bondman shall come in a day when he does not expect it, and in an hour he knows not of, and shall cut him in two and appoint his portion with the unbelievers.

But brother prosecutes his suit with brother, and that before unbelievers.

But if any one of the unbelievers invite you, and ye are minded to go, all that is set before you eat, making no inquiry for conscience sake.

So that tongues are for a sign, not to those who believe, but to unbelievers; but prophecy, not to unbelievers, but to those who believe.

If therefore the whole assembly come together in one place, and all speak with tongues, and simple persons enter in, or unbelievers, will not they say ye are mad?

Be not diversely yoked with unbelievers; for what participation is there between righteousness and lawlessness? or what fellowship of light with darkness?