3 occurrences across the corpus

King James Version

Job 40:15

Behold now behemoth, which I made with thee; he eateth grass as an ox.

1 Enoch

1 Enoch 60:8

But the male is named Behemoth, who occupied with his breast a waste wilderness named Dûidâin, on the east of the garden where the elect and righteous dwell, where my grandfather was taken up, the seventh from Adam, the first man whom the Lord of Spirits created.

OT Pseudepigrapha

2 Baruch 29:4

And Behemoth shall be revealed from his place and Leviathan shall ascend from the sea, those two great monsters which I created on the fifth day of creation, and shall have kept until that time; and then they shall be for food for all that are left.