Isaiah 28:11
For with stammering lips and another tongue he will speak to this people.
1 Corinthians 14:21
In the law it is written, In other tongues and with other lips I will speak unto this people; and yet for all that, they will not hear me, saith the Lord.
Deuteronomy 28:49
The LORD shall bring a nation against thee from afar, from the end of the earth, as swift as the eagle flies, a nation whose tongue thou shalt not understand,
Isaiah 33:19
Thou shalt not see that fierce people, a people of a darker speech than thou can perceive; of a stammering tongue, that thou can not understand.
Jeremiah 5:15
Behold, I will bring a nation upon you from afar, O house of Israel, saith the LORD; it is a mighty nation, it is an ancient nation, a nation whose language thou dost not know, neither dost thou understand what they say.