Woe to you, O destroyer never destroyed, O traitor never betrayed! When you have finished destroying, you will be destroyed. When you have finished betraying, you will be betrayed.
KJV
Woe to thee that spoilest, and thou [wast] not spoiled; and dealest treacherously, and they dealt not treacherously with thee! when thou shalt cease to spoil, thou shalt be spoiled; [and] when thou shalt make an end to deal treacherously, they shall deal treacherously with thee.
ASV
Woe to thee that destroyest, and thou wast not destroyed; and dealest treacherously, and they dealt not treacherously with thee! When thou hast ceased to destroy, thou shalt be destroyed; and when thou hast made an end of dealing treacherously, they shall deal treacherously with thee.