Kommentar zu Jirmejahu 28:7

But, hearken now... The prophet who would prophesy for peace. He said: I prophesy retribution. If it does not come, I am not a liar, for the Holy One, blessed be He, renounces the evil, but the prophet who prophesies for peace, etc., when the word of the prophet comes, etc., but if his word does not come, he is a liar, as it is said, “God is not a man that He should lie, etc.” (Num. 23:19). In this manner Rabbi Tanhuma (Vayera 13) expounded.