'Labour' in the Bible

Therefore said I, Look away from me; let me weep bitterly: labour not to comfort me, because of the spoiling of the daughter of my people.

Wherefore do ye spend money for that which is not bread? and your labour for that which satisfieth not? Hearken diligently unto me, and eat ye that which is good, and let your soul delight itself in fatness.

They shall not labour in vain, nor bring forth for terror; for they are the seed of the blessed of Jehovah, and their offspring with them.