'Labor' in the Bible

“Is not man forced to labor on earth?And are not his days like the days of a hired man?

“I am accounted wicked and held guilty;Why then should I labor in vain [to appear innocent]?

“Will you trust him because his strength is greatAnd leave your labor to him?

“She treats her young cruelly, as if they were not hers;Though her labor is in vain because she is unconcerned [for the safety of her brood],