Israel has the right to exist as a nation. Let's just get that one off the table right away. Israel, or more accurately the descendants of Jacob, whom according to the Bible the Lord named "Israel", finally became a reality for the Jewish people in 1949 after a guerilla war for independence with the British Empire. Initially restricted to a tiny strip of land sandwiched between Lebanon, Syria, Jordan and its old friend/nemesis Egypt, Israel has slowly gained in territory after consecutive successful wars with their neighbors.
According to the Bible, the Lord promised Abraham (Abram at the time):
" On the same day the Lord made a covenant with Abram, saying: To your descendants I have given this land, from the river of Egypt to the great River Euphrates." (Book of Genesis)
In other words, this: