'Ploweth' in the Bible

As when one ploweth and cleaveth the earth, Our bones are scattered at the mouth of Sheol.

Doth he that ploweth to sow plow continually? doth he continually open and harrow his ground?

Or saith he it altogether for our sakes? For our sakes, no doubt, this is written: that he that ploweth should plow in hope; and that he that thresheth in hope should be partaker of his hope.