John Gill Commentary Isaiah 36:13

"Then Rabshakeh stood, and cried with a loud voice in the Jews` language, and said, Hear ye the words of the great king, the king of Assyria." — Isaiah 36:13 (ASV)

Then Rabshakeh stood, and cried with a loud voice in the Jews'
language
In which he spoke before; but now he raised up himself, and elevated his voice, and strained himself to the utmost, that all the people might hear, and that he might strike a terror into them, and stir them up to mutiny and rebellion, and oblige their governors to give up the city into the hands of the Assyrians; this use he made of the request of Hezekiah's ministers, perceiving hereby their fears, and the disposition of the people: and said, hear you the words of the great king, the king of Assyria ;
(See Gill on Isaiah 36:4).