Origen

“ And seeking to ascertain what might be the inference from the heavenly Jerusalem belonging to the lot of Benjamin and the valley of Ennom, we find a certain confirmation of what is said regarding the place of punishment, intended for the purification of such souls as are to be purified by torments, agreeably to the saying: “The Lord cometh like a refiner’s fire, and like fullers’ soap: and He shall sit as a refiner and purifier of silver and of gold.” ”

“ This Leviathan, the Jewish Scriptures say, whatever they mean by the expression, was created by God for a plaything; [2] for we find in the Psalms: “In wisdom hast Thou made all things: the earth is full of Thy creatures; so is this great and wide sea. There go the ships; small animals with great; there is this dragon, which Thou hast formed to play therein.” [3] Instead of the word “dragon,” the term “leviathan” is in the Hebrew. This impious diagram, then, said of this leviathan, which is so clearly depreciated by the Psalmist, that it was the soul which had travelled through all things! ”