I thought Proverbs 16:27 might say "an evil man is the furnace (kaf vav resh
as kaf resh) of evil (hay resh ayin hay), and upon his lips it (evil) burns
like a fire." I am not sure if it is grammatically correct this way.
According to Yitzhak a German scholar said the same thing, so it is probably
something other people have considered too.
Yitzhak, I like this one better than your way because the lips part does not
sound right in your way. I don't think a furnace would burn on his lips, but
the evil man as the furnace with evil burning on his lips sounds like other
quotes describing how people spoke evil things.