'Labour' in the Bible

Hath not man a life of labour upon earth? and are not his days like the days of a hireling?

Be it that I am wicked, why then do I labour in vain?

Wilt thou put confidence in him, because his strength is great? and wilt thou leave thy labour to him?

She is hardened against her young ones, as though they were not hers; her labour is in vain, without her concern.