Rashi on Daniel
its width six cubits; he set it up etc. If its thickness was only six [cubits], how could it stand at a height of sixty cubits? Said Rav Bibi: They would set it up and it would fall, until they brought all the gold of Jerusalem and poured a base around its feet, to fulfill what was said (Ezek. 7:19): “and their gold will be for a repugnant thing.”