Israel was given the land to be a Jewish State by the League of Nations in 1922, later to become the United Nations, and Article 80 protects the Jews right to be there.
Resolutions by the UN that violate that Law are illegal.
The laughable thing is, whilst being an illegal Act by the UN splitting up the land to offer some to the Arabs, the Arabs refused, when they could have got what they are asking for right now.
The Arabs want all the land, not just the land that Jordan occupied, known as the West Bank. That is not enough for them.
All legal jurisdiction and authority from the League of Nations, was transferred to the UN when it was formed in 1948. And resolutions by the UNSC are binding and therefore, the law.
There were conditions to granting Israel the land. They could only have it if they respected the inherent rights of the indigenous population of non-Jewish residents. But they didn't do that. Zionists brought with them, racist, apartheid policies for land ownership and labor. And they had jewish terrorists groups like Irgun, drive out over 700,000 arab residents.
And that "offer" to the arabs, was not a fair offer. What person in their right mind would accept a deal that would require you to give up 70% of your property to the new kids on the block?
The West Bank, Golan Heights, Gaza and East Jerusalem, is not Israeli land. And it will never be Israeli land. For the world community to allow Israel any part of that land, would be the same as saying it was okay for Hitler to annex Poland.