Ezekiel 4:1-3

1Thou also, son of man, take thee a tile, and lay it before thee, and portray upon it the city, even Jerusalem:

2And lay siege against it, and build a fort against it, and cast a mound against it; set the camp also against it, and set battering rams against it on every side.1

3Moreover take thou to thee an iron pan, and set it for a wall of iron between thee and the city: and set thy face against it, and it shall be besieged, and thou shalt lay siege against it. This shall be a sign to the house of Israel.2