Albert Barnes Commentary Jeremiah 23:28

"The prophet that hath a dream, let him tell a dream; and he that hath my word, let him speak my word faithfully. What is the straw to the wheat? saith Jehovah." — Jeremiah 23:28 (ASV)

A dream ... faithfully — Rather, as “a dream”... as truth. The dream is only a dream and is to be told as such, but God’s word is to be spoken as certain and absolute truth.

The dreams are the chaff, worthless, with nothing in them; the wheat, the pure grain after it is cleansed and winnowed, is God’s word. What have these two in common?