38 Although you claim, ‘This is a message from the LORD,’ this is what the LORD says: You used the words, ‘This is a message from the LORD,’ even though I told you that you must not claim, ‘This is a message from the LORD.’

Read Jeremiah 23:38 Using Other Translations

But since ye say, The burden of the LORD; therefore thus saith the LORD; Because ye say this word, The burden of the LORD, and I have sent unto you, saying, Ye shall not say, The burden of the LORD;
But if you say, 'The burden of the LORD,' thus says the LORD, 'Because you have said these words, "The burden of the LORD," when I sent to you, saying, "You shall not say, 'The burden of the LORD,'
But suppose they respond, ‘This is a prophecy from the LORD !’ Then you should say, ‘This is what the LORD says: Because you have used this phrase, “prophecy from the LORD,” even though I warned you not to use it,