Do you have faith in him that he will return your grain and gather it to your threshing floor?
God here shows Job what little acquaintance he had with the untamed creatures that run wild in the deserts and live at large, but are the care of the divine Providence. As, I. The wild goats and the hinds. That which is taken notice of concerning them is the bringing forth and bringing up of their young ones.
Commenting on Job 39:1-12
Wilt thou believe him that he will bring home thy seed?.... Draw in the cart, and bring home the ripe sheaves of corn, as the tame ox does? no; thou knowest him too well to believe he will bring it home in safety; and gather it into thy barn; to be trodden out, which used to be done by oxen in those times: if therefore...
believe--trust. seed--produce (Sa1 8:15). into thy barn--rather, "gather (the contents of) thy threshing-floor" [MAURER]; the corn threshed on it.