Ezekiel 4:3

Take thou unto thee an iron pan— The prophet takes to him an iron pot or vessel, such as fire was wont to be carried in before the Chaldean and Persian generals, when they went to battle. And he puts it for a wall of iron between him and the city, to signify the force and strength of that army whose symbol was fire. Then he sets, or hardens his face against the city, as men look fiercely, who are inflexibly bent on the ruin of another; and he lays siege to it, or declares the city should be besieged by surrounding it. In all this scenery, the text, says Ezekiel, was a sign to the house of Israel, or, in other words, a type of what the Chaldean king and his army should act against Jerusalem. See Bishop Chandler's Defence, p. 170.