Isaiah 33:19

Never again will you see the cruel people, a people whose tongue has no sense for you; whose language is strange to you.

Isaiah 28:11

No, but with broken talk, and with a strange tongue, he will give his word to this people:

Deuteronomy 28:49-50

The Lord will send a nation against you from the farthest ends of the earth, coming with the flight of an eagle; a nation whose language is strange to you;

Jeremiah 5:15

See, I will send you a nation from far away, O people of Israel, says the Lord; a strong nation and an old nation, a nation whose language is strange to you, so that you may not get the sense of their words.

2 Kings 19:32

For this cause the Lord says about the king of Assyria, He will not come into this town, or send an arrow against it; he will not come before it with arms, or put up an earthwork against it;

Ezekiel 3:5-6

For you are not sent to a people whose talk is strange and whose language is hard, but to the children of Israel;

Exodus 14:13

But Moses said, Keep where you are and have no fear; now you will see the salvation of the Lord which he will give you today; for the Egyptians whom you see today you will never see again.

1 Corinthians 14:21

In the law it is said, By men of other tongues and by strange lips will my words come to this people; and not even so will they give ear to me, says the Lord.

Treasury of Scripture Knowledge

Summary

Thou shalt not see a fierce people, a people of a deeper speech than thou canst perceive; of a stammering tongue, that thou canst not understand.

Bible References

Shalt not

Exodus 14:13
But Moses said, Keep where you are and have no fear; now you will see the salvation of the Lord which he will give you today; for the Egyptians whom you see today you will never see again.
Deuteronomy 28:49
The Lord will send a nation against you from the farthest ends of the earth, coming with the flight of an eagle; a nation whose language is strange to you;
2 Kings 19:32
For this cause the Lord says about the king of Assyria, He will not come into this town, or send an arrow against it; he will not come before it with arms, or put up an earthwork against it;

Deeper

Isaiah 28:11
No, but with broken talk, and with a strange tongue, he will give his word to this people:
Jeremiah 5:15
See, I will send you a nation from far away, O people of Israel, says the Lord; a strong nation and an old nation, a nation whose language is strange to you, so that you may not get the sense of their words.
Ezekiel 3:5
For you are not sent to a people whose talk is strange and whose language is hard, but to the children of Israel;
1 Corinthians 14:21
In the law it is said, By men of other tongues and by strange lips will my words come to this people; and not even so will they give ear to me, says the Lord.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain