Midrash su Geremia 27:22

(Fol. 24b) R. Abba tried to avoid the sight of R. Juda because he wanted to go to Palestine and R. Juda always said: "Whoever goes up from Babylon to Palestine transgresses the positive law which says (Jer. 27, 22.) Unto Babylon shall they be carried, and there shall they remain until the day that I think of them, saith the Lord." One day R. Abba said I shall go and hear something from him and then I will depart. So he went and found a Tana reciting before R. Juda regarding cleanliness, while praying. (See text.) R. Abba then said, "Were it only for that single thing that I came to listen, it would be sufficient."

(Ibid. 21) "And when you say in your heart: How shall we know the thing which the L-rd has not spoken?": Jeremiah said about the remaining (Temple) vessels (Jeremiah 27:22) "They shall be brought to Bavel and there shall they remain." Chananiah (ben Azur) said (Ibid. 28:3) "I will restore to this place all the vessels of the house of the L-rd." Whom shall we heed? It is, therefore, written (Devarim, Ibid. 22) "What the prophet shall speak in the name of the L-rd and the thing not be and not come to pass, that is the thing which the L-rd has not spoken." "In presumption has the prophet spoken it.": He is liable (to the death penalty) for (willful) presumption, and not for unwittingness.