'Labor In Vain' in the Bible

Shall I do evil, wherefore this shall I labor in vain?

She made hard to her sons as not to her: her labor in vain without fear;

They shall not labor in vain, and they shall not bring forth for terror; for they the seed of the blessed of Jehovah, and their offspring with them.

Thus said Jehovah of armies: The broad walls of Babel being demolished, shall be demolished, and her high gates shall be burnt in fire; the peoples shall labor in vain, the nations for the fire, and they shall be weary.