This curse really shows the Power of The Word and of our ancestors.
Read Jubilees Chapter 24.
Jubilees 24:28
And Isaac on that day cursed the Philistines and said: 'Cursed be the Philistines unto the day of wrath and indignation from the midst of all nations; may God make them a derision and a curse and an object of wrath and indignation in the hands of the sinners the Gentiles and in the hands of the Kittim.