Charles Ellicott Commentary Jeremiah 28:16

"Therefore thus saith Jehovah, Behold, I will send thee away from off the face of the earth: this year thou shalt die, because thou hast spoken rebellion against Jehovah." — Jeremiah 28:16 (ASV)

I will cast you ... —Literally, I send you. The verb is the same as in the preceding verse and is repeated with an emphatic irony.

This year you shall die ... —The punishment is announced, with time given for repentance. In part, perhaps, the threat may have tended to work out its own fulfilment through the gnawing consciousness of shame and confusion in the detection of the false prophet’s assumptions. He knew that the Lord had not sent him. Seven months passed, and then the stroke fell. It is one of the instances of the prophet’s work, as “rooting out” and “pulling down” (Jeremiah 1:10), and has its parallels in the punishment of Ananias, in Acts 5:4-5, and of Elymas, in Acts 13:11.