John Calvin on Jeremiah 27:14

He repeats the same words which we have met with before; there is therefore no need of dwelling long on them here. Yet the repetition was not superfluous; for he had a hard contest with the false prophets, who had attained great authority. As Jeremiah alone made an onset on the whole multitude, the greater part of them might have objected and said, that in matters of such perplexity there was nothing certain or clear. As therefore it was not easy to convince the Jews who were disposed to believe the false prophets, it was necessary to say the same thing often, as we shall also see hereafter. He adds, —

Jeremiah 27:15

15. For I have not sent them, saith the LORD, yet they prophesy a lie in my name; that I might drive you out, and that ye might perish, ye, and the prophets that prophesy unto you.

15. Quia non misi eos, dicit Jehova, et ipsi prophetant in nomine meo ad mendacium (id est, fallacium) ut vos ejiciam, et pereatis vos et prophetae, qui prophetant vobis.