Plain wrong. Israel’s borders can be fully inferred from the bible’s descriptions. Wikipedia even has illustrations:
Land of Israel
The Land of Israel ( Hebrew: אֶרֶץ יִשְׂרָאֵל , Eretz Yisrael , ʼÉreṣ Yiśrāʼēl ) is the traditional Jewish name for an…
and also, Originating with King David? Have you ever heard of Abraham, Isaac, and Yaakov? Those are our founding fathers. King David may be a prominent figure in Judaism but he came much later. King Shaul Preceded him in the ruling of Israel.