Verses with the word leviathan in the Apocrypha (2 verses):

2 Esdras 6:49
Then didst thou ordain two living creatures, the one thou calledst Enoch, and the other Leviathan;

2 Esdras 6:52
But unto Leviathan thou gavest the seventh part, namely, the moist; and hast kept him to be devoured of whom thou wilt, and when.