19 You will no longer see the fierce people, a people of a deep speech that you can’t comprehend, with a strange language that you can’t understand.
Isaiah 33:19 Cross References - WEB
Exodus 14:13
13 Moses said to the people, “Don’t be afraid. Stand still, and see the salvation of Yahweh, which he will work for you today; for you will never again see the Egyptians whom you have seen today.
Deuteronomy 28:49-50
2 Kings 19:32
32 “Therefore Yahweh says concerning the king of Assyria, ‘He will not come to this city, nor shoot an arrow there. He will not come before it with shield, nor cast up a mound against it.
Isaiah 28:11
11 But he will speak to this nation with stammering lips and in another language,
Jeremiah 5:15
15 Behold, I will bring a nation on you from far away, house of Israel,” says Yahweh. “It is a mighty nation. It is an ancient nation, a nation whose language you don’t know and don’t understand what they say.
Ezekiel 3:5-6
1 Corinthians 14:21
21 In the law it is written, “By men of strange languages and by the lips of strangers I will speak to this people. They won’t even hear me that way, says the Lord.”