'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 assuredly for our sake? Yea, for our sake it was written: because he that ploweth ought to plow in hope, and he that thresheth, to thresh in hope of partaking.