In Jewish apocrypha and pseudepigrapha such as the 2nd century BCE Book of Enoch, Behemoth is the primal unconquerable monster of the land, as Leviathan is the primal monster of the waters of the sea and Ziz the primordial monster of the sky.
In the Haggadah, Behemoth's strength reaches its peak on the summer solstice of every solar year (around 21 June).