Tosefta do Izajasza 66:24

Fire and mixtures [of animals] are not [actually existent] from the six days of creation, but they are considered to be [as if they are existent] from six days of creation. Rebbi Yossi says, “The fire of hell was created on the second day [of creation] and will never be extinguished, as it is said, ‘And they will go out and see the corpses of men who rebelled against Me, because their worms will not die and their fire will not be extinguished, and they will be loathsome to all mankind.’” (Isaiah 66:24) We do not say a Beracha (blessing) [on seeing the light of the fire and on smelling the spices during Havdalah] on the fire and spices of a bathhouse.