1 Corinthians 14:22-24

Young's Literal Translation

²² so that the tongues are for a sign, not to the believing, but to the unbelieving; and the prophesy [is] not for the unbelieving, but for the believing,

²³ If, therefore, the whole assembly may come together, to the same place, and all may speak with tongues, and there may come in unlearned or unbelievers, will they not say that ye are mad?

²⁴ and if all may prophecy, and any one may come in, an unbeliever or unlearned, he is convicted by all, he is discerned by all,