Yechezkel 4:1-3

Orthodox Jewish Bible

4 Thou also, Ben Adam, take thee a levenah (tile, brick), and lay it before thee, and engrave upon it the Ir, even Yerushalayim;

² And lay matzor (siege) against it, and erect against it siege works, and build a ramp against it; set the machanot also against it, and set battering rams against it all around.

³ Moreover take thou unto thee a machavat barzel (iron griddle), and set it for a kir barzel (wall of iron) between thee and the Ir; and set thy face against it, and it shall be besieged, and thou shalt lay siege against it. This shall be an ot (sign) to Bais Yisroel.