41 Thou also, son of man, take thee a tile, and lay it before thee, and portray upon it a city, even Jerusalem: 2 and lay siege against it, and build forts against it, and cast up a mound against it; set camps also against it, and plant battering rams against it round about. 3 And take thou unto thee an iron pan, and set it for a wall of iron between thee and the city: and set thy face toward it, and it shall be besieged, and thou shalt lay siege against it. This shall be a sign to the house of Israel.
Matthew Henry's Commentary on Ezekiel 4:1-3
Commentary on Ezekiel 4:1-8
(Read Ezekiel 4:1-8)
The prophet was to represent the siege of Jerusalem by signs. He was to lie on his left side for a number of days, supposed to be equal to the years from the establishment of idolatry. All that the prophet sets before the children of his people, about the destruction of Jerusalem, is to show that sin is the provoking cause of the ruin of that once flourishing city.