Because you harbored an ancient hatred and delivered the Israelites over to the sword in the time of their disaster at the final stage of their punishment,
KJV
Because thou hast had a perpetual hatred, and hast shed [the blood of] the children of Israel by the force of the sword in the time of their calamity, in the time [that their] iniquity [had] an end:
ASV
Because thou hast had a perpetual enmity, and hast given over the children of Israel to the power of the sword in the time of their calamity, in the time of the iniquity of the end;