'Laboured' in the Bible

And each at his friend they mock, And truth they do not speak, They taught their tongue to speak falsehood, To commit iniquity they have laboured.

Thus saith Jehovah of hosts: The broad walls of Babylon shall be utterly laid bare, and her high gates shall be burned with fire; so that the peoples will have laboured in vain, and the nations for the fire: and they shall be weary.