How long shall this be in the heart of the prophets that
prophesy lies?
&c.] To invent such lies, and deceive the people, and turn them away from God; agreeably to the preceding and following verses: this shows that this was not through ignorance and inadvertence; it was a meditated and studied thing by them; they contrived it in their hearts, and they were resolute and bent upon it, and took much delight and pleasure in it; their hearts were in it, and it was in them to do as they did; and in this way they had been long, but should continue no longer. Or the words may be rendered, "how long?"