In the book of Yehoshua {Joshua}, chapter 1, larger borders than the above map, are promised to Israel by the Holy One Blessed be He, to the nation of Israel, as it is written:
Every place on which the soles of your feet will tread I have given to you, as I have spoken to Moshe {Moses}. From this desert and Lebanon to the great river, the Euphrates, all the land of the Hittites to the great sea westward shall be your boundary.
It is a mitzva to expand the ownership of Israel over the land of Israel, as explained in Shulchan Aruch, O.C., chapter 306, halacha 11: “It is permissible to purchase a house in the land of Israel from the non-Jew on the Sabbath and he {the non-Jew} signs the contract and makes the sale legal by the {non-Jewish} court”. The Mishna Brura explains: To Purchase a house – “And how does he do this? He shows him purses with Dinar coins and the non-Jew signs and makes the sale legal by the {non-Jewish} court, however, it is forbidden to give him money in an explicit way. In the land of Israel – And Suria is like the land of Israel for this matter, and so too, wrote Rambam, and see carefully what Magen Avraham wrote about this.”… “they permitted in this instance by means of a non-Jew, because of the settlement of the land of Israel.
You are praiseworthy, that you will merit to fulfill the mitzva of expansion in accordance with the prophetic command, “Expand the place of your tent” (Yishayahu {Isaiah} Cahpter 54); for this mitzva will bring the ingathering of the exiles in mercy, as it is written there afterwards, “For right and left shall you advance, and your seed shall inherit nations and repeople desolate cities”, etc. … “and with great mercy will I gather you”.
An excerpt from the blessing of the Vilna Gaon to his students, who securely made the promise to him, to travel to the Holy Land, and see more about this matter in the article on this web site, Miracles of the Gulf War