'Labored' in the Bible

Stand now with thine enchantments, and with the multitude of thy sorceries, wherein thou hast labored from thy youth; if so be thou shalt be able to profit, if so be thou mayest prevail.

Thus shall the things be unto thee wherein thou hast labored: they that have trafficked with thee from thy youth shall wander every one to his quarter; there shall be none to save thee.

But I said, I have labored in vain, I have spent my strength for nought and vanity; yet surely the justice due to me is with Jehovah, and my recompense with my God.

Jehovah hath sworn by his right hand, and by the arm of his strength, Surely I will no more give thy grain to be food for thine enemies; and foreigners shall not drink thy new wine, for which thou hast labored: