Isaiah 33:19 in the King James Version
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.
Context
18 Your heart will meditate on the terror. Where is he who counted? Where is he who weighed? Where is he who counted the towers?
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.
20 Look at Zion, the city of our appointed festivals. Your eyes will see Jerusalem, a quiet habitation, a tent that won’t be removed. Its stakes will never be plucked up, nor will any of its cords be broken.