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?"
The Brenton translation of the Septuagint is in the public domain.