The demon Behemoth appears in the books Paradise Lost and Dictionnaire Infernal
From The Bible:
“Look at Behemoth,
which I made just as I made you;
it eats grass like an ox.
Its strength is in its loins,
and its power in the muscles of its belly.
It makes its tail stiff like a cedar;
the sinews of its thighs are knit together.
Its bones are tubes of bronze,
its limbs like bars of iron.