The word that came to Jeremiah - This prophecy is supposed to have been delivered in the first year of the reign of Jehoiakim, son of Josiah, who, far from following the example of his pious father, restored idolatry, maintained bad priests and worse prophets, and filled Jerusalem with abominations of all kinds.
In Jeremiah 10:1-2. The temple had several entrances 2 Chronicles 4:9; and the gate or door here mentioned is probably that of the inner court, where Baruch read Jeremiah‘s scroll Jeremiah 36:10. The prophet stood in the doorway, and addressed the people assembled in the outer court.
All ye of Judah - Better, literally all Judah (compare Jeremiah 26:2).