Charles Ellicott Commentary Jeremiah 36:6

"therefore go thou, and read in the roll, which thou hast written from my mouth, the words of Jehovah in the ears of the people in Jehovah`s house upon the fast-day; and also thou shalt read them in the ears of all Judah that come out of their cities." — Jeremiah 36:6 (ASV)

In the Lord’s house upon the fasting day.— Literally, a fast day. We learn from Jeremiah 36:9 that this was one of the special fasts “proclaimed” in times of national distress (2 Chronicles 20:3–4; 1 Kings 21:10), and it was accordingly a time when the courts of the Temple would be more than usually thronged, and when, it might be hoped, the people gathered in them would be more than usually disposed to listen to warnings and exhortations to repentance. Probably, however, the king had proclaimed the fast on the advice of the priests and false prophets, to rouse the people to the “holy war” of an enthusiastic religious resistance to the Chaldeans, and this may account for the eagerness of Jeremiah to counteract the scheme with the unexpected sermon.

The addition, and also thou shalt read them in the ears of all Judah, implies that Baruch was, if opportunity offered, to read the words of the prophecy on other occasions and to other gatherings of the people. The ordinary fast of the Day of Atonement was, it will be remembered, in the seventh month—i.e., October; this accordingly was in November or December. This agrees, it may be noted, with the charcoal fire which was burning in the king’s chamber (Jeremiah 36:22).