1 Corinthians 14:21

21 In the law it is written, "By people of strange tongues and by the lips of foreigners I will speak to this people; yet even then they will not listen to me," says the Lord.

1 Corinthians 14:21 In-Context

19 nevertheless, in church I would rather speak five words with my mind, in order to instruct others also, than ten thousand words in a tongue.
20 Brothers and sisters, do not be children in your thinking; rather, be infants in evil, but in thinking be adults.
21 In the law it is written, "By people of strange tongues and by the lips of foreigners I will speak to this people; yet even then they will not listen to me," says the Lord.
22 Tongues, then, are a sign not for believers but for unbelievers, while prophecy is not for unbelievers but for believers.
23 If, therefore, the whole church comes together and all speak in tongues, and outsiders or unbelievers enter, will they not say that you are out of your mind?
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.