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