King James Version (KJV) - Psalms 137:8 >

O daughter of Babylon, who art to be destroyed; happy [shall he be], that rewardeth thee as thou hast served us.

Jewish Publication Society of America Version (JPS1917) - Psalms 137:8 >

O daughter of Babylon, that art to be destroyed; happy shall he be, that repayeth thee as thou hast served us.