The burden of the LORD: See verse 33.

Good News Translation helps clarify what this verse is trying to say, which is essentially “If you disobey me and do use the words ‘the burden the LORD imposes’ even though I told you not to say them, then because of that….”

Quoted with permission from Newman, Barclay M. and Stine, Philip C. A Handbook on Jeremiah. (UBS Helps for Translators). New York: UBS, 2003. For this and other handbooks for translators see here .