Ezekiel 4:1-3

“Now, son of man, take a block of clay, put it in front of you and draw the city of Jerusalem on it. Then lay siege to it: Erect siege works against it, build a ramp up to it, set up camps against it and put battering rams around it. Then take an iron pan, place it as an iron wall between you and the city and turn your face toward it. It will be under siege, and you shall besiege it. This will be a sign to the people of Israel.