Canst thou bind the unicorn in the furrow? That is, in thy furrowed field, or to, or for the furrow? that is, to make furrows, or to plough, for which work cattle are usually bound together, that they may be directed by the husbandmen, and may make right furrows. Will he harrow the valleys The low grounds; after thee? Under thy conduct, following thee step by step? Wilt thou trust him Namely, for the doing of these works; because his strength is great? Because he is very able to do them. Wilt thou, by thy power, make him willing, or force him to put forth his strength in thy service? Wilt thou leave thy labour Thy work of ploughing and harrowing; or the fruit of thy labour, namely, the fruits of the earth, procured by God's blessing upon thy industry, to him? Wilt thou leave them to him to be brought home into thy barns? as the next verse explains it.
Related Commentaries of Job 39:10
Job 39:10-11
10 Canst thou bind the unicorn with his band in the furrow? or will he harrow the valleys after thee?
11 Wilt thou trust him, because his strength is great? or wilt thou leave thy labour to him?