This shall be a sign — Signs are usually antecedent to the thing signified, but the word is taken in a larger notion in this place for that which should attend the thing signified by it.
Related Commentaries of Jeremiah 44:29
Jeremiah 44:29
29 And this shall be a sign unto you, saith the LORD, that I will punish you in this place, that ye may know that my words shall surely stand against you for evil: