'Labour' in the Bible

Behold, is it not of Jehovah of hosts that the peoples labour for the fire, and the nations weary themselves in vain?

For though the fig-tree shall not blossom, Neither shall fruit be in the vines; The labour of the olive-tree shall fail, And the fields shall yield no food; The flock shall be cut off from the fold, And there shall be no herd in the stalls: