Anything between the river and the sea is yours, if you meet someone there, just kill them, it's cool
-God
Edit for the hater: I will establish your borders from the Red Sea to the Mediterranean Sea, and from the desert to the Euphrates River. I will give into your hands the people who live in the land, and you will drive them out before you. Exodus 23:31
From a book that Jews, Muslims (and Chriatians) all consider "holy".
When everyone in a conflict can consider themselves to have a god-given right to the same chunk of dirt, it can be a bit of a challenge to find a mutually acceptable solution.