1 Wakorintho 14:22

Basi kunena kwa lugha ni ishara, si kwa watu waaminio, bali kwa wasioamini, wakati unabii si kwa ajili ya wasioamini, bali kwa ajili ya waaminio.

Wherefore tongues are for a sign, not to them that believe, but to them that believe not: but prophesying serveth not for them that believe not, but for them which believe.