Anything That Can Withstand Fire

Then Eleazar the priest said to the soldiers
who had gone into battle,
"This is the requirement of the law
that the Lord gave Moses:
Gold, silver, bronze, iron, tin, lead
and anything else that can withstand fire
must be put through the fire,
and then it will be clean.
But it must also be purified 
with the water of cleansing.
And whatever cannot withstand fire
must be put through that water.
On the seventh day wash your clothes
and you will be clean.
Then you may come into the camp."

(Numbers 31:21-24)