Isaiah 33:19

You will see no more the insolent people , the people of an obscure speech that you cannot comprehend , stammering in a tongue that you cannot understand .

You will see those arrogant people no more, people whose speech is obscure, whose language is strange and incomprehensible.

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.