The LORD hath sworn by his right hand, and by the arm of his strength, Surely I will no more give thy corn to be meat for thine enemies; and the sons of the stranger shall not drink thy wine, for the which thou hast laboured:
The Lord promises, using His power, that He won't let your food be eaten by your enemies anymore. Also, those who are not from your family won't drink the wine you worked hard to make.