Following the claims made by the people, the prophet receives a strict command to deliver a counter-prophecy. This new message serves as a direct and immediate reaction to their statements. He is tasked with stepping forward and speaking the exact opposite of what the people have been saying.
The instruction to prophesy is delivered with a clear sense of urgency. The call to action is repeated in order to hasten the prophet and encourage him to carry out his mission without delay [מצודת דוד].