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 to this people; and yet for all that will they not hear me, saith the Lord.
Deuteronomy 28:49
The LORD shall bring a nation against thee from far, from the end of the earth, as swift as the eagle flieth, a nation whose language thou shalt not understand:
Isaiah 33:19
Thou shalt not see a fierce people, a people of deeper speech than thou canst perceive; of a stammering tongue, that thou canst not understand.
Jeremiah 5:15
Lo, I will bring a nation upon you from far, O house of Israel, saith the LORD: it is a mighty nation, it is an ancient nation, a nation whose language thou knowest not, neither understandest what they say.