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.
Isaiah 28:11
For with stammering lips and another tongue will he speak to this people.
Deuteronomy 28:49-50
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;
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.
2 Kings 19:32
Therefore thus says the LORD concerning the king of Assyria, He shall not come into this city, nor shoot an arrow there, nor come before it with shield, nor cast up a siege mound against it.
Ezekiel 3:5-6
For you are not sent to a people of foreign speech and of a hard language, but to the house of Israel;
Exodus 14:13
And Moses said unto the people, Fear not, stand still, and see the salvation of the LORD, which he will show to you today: for the Egyptians whom you have seen today, you shall see them again no more forever.
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.