Ezekiel 24:9-12

“ ‘Therefore this is what the Sovereign LORD says: “ ‘Woe to the city of bloodshed! I, too, will pile the wood high. So heap on the wood and kindle the fire. Cook the meat well, mixing in the spices; and let the bones be charred. Then set the empty pot on the coals till it becomes hot and its copper glows, so that its impurities may be melted and its deposit burned away. It has frustrated all efforts; its heavy deposit has not been removed, not even by fire.