'Speech' in the Bible

For you are not being sent to a people of unintelligible speech and difficult language, but to the house of Israel --

not to many peoples of unintelligible speech and difficult language, whose words you cannot understand -- surely if I had sent you to them, they would listen to you!

Then I said, "O sovereign Lord! They are saying of me, 'Does he not simply speak in eloquent figures of speech?'"

You exalted yourselves against me with your speech and hurled many insults against me -- I have heard them all!