Job 15

                                 Behemoth and Leviathan

Also can any understand the spreadings of the clouds, or the noise of his tabernacle? (Job 36:29)

Also by watering he wearieth the thick cloud: he scattereth his bright cloud: And it is turned round about by his counsels (Job 37:11-12)

Behold now behemoth . . . He is the chief of the ways of God (Job 40:15, 19)

. . . he is a king over all the children of pride (Job 41: 34)

Behold now behemoth, which I made with thee (Job 40:15)

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Like most of Blake's plates this one is in three levels:

God, attended by two angels, is pointing down to the third

level, a globe.

The second level shows Job, with  his wife and three 'friends'

taking in God's lesson.

The globe represents the 'circle of destiny' or 'this vale of tears:

The 'behemoth, chief of the ways of 'God' ('God' in this case represents the 'God' referred to and prayed to at the 
conventional churches.)

Leviathan is described in its entirety in the 41 chapter
of Job. Andrew Wright (page 39) the scaly coiled length of this sea going creature.

Both fearful entities are creatures, "the fearful symmetry of the one inescapably related to the materiality of the other".

Is Blake portraying the two contraries, the O.T. God and the material pair of monsters?
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Blake was undoubtedly familiar with the Book of
Revelation; he used it as a source of much of his
poetry.

The 13th chapter speaks of two beasts, one who rose
up out of the sea (13:1) and another coming up out
of the earth (13:11). And in  the great whore who sat
upon a 'scarlet-colored beast (17).

We can only speculate about the relations among these quotations from Job and Revelation.