Ezekiel 4:1-3

1“Now you, son of man, take a brick, place it before you and inscribe on it [a diagram of] the city of Jerusalem.

2Then lay siege against it, build a siege wall, raise a ramp against it; set up [enemy] camps and place battering rams all around it.

3Further, take an iron plate and place it as an iron wall between you and the city, and set your face toward it so that it is under siege, and besiege it. This is a sign to the house of Israel.