Ezekiel 24:10-12

Amplified Bible

¹⁰ 
“Heap on wood, kindle the fire,
Boil the meat well [done]
And mix in the spices,
And let the bones be burned.
¹¹ 
“Then set the empty pot (Jerusalem) back on the coals
So that it may be hot
And its bronze may glow
And its filthiness may be melted
And its rust (scum) may be consumed.
¹² 
“She has wearied Me with toil,
Yet her great rust has not left her;
Her thick rust and filth will not be burned away by fire [no matter how hot the flame].