'Everlasting Possession' in the Bible

And I will give to thee, and to thy seed after thee, the land in which thou art a stranger, all the land of Canaan, for an everlasting possession; and I will be their God.

And said to me, Behold I will make thee fruitful, and multiply thee, and I will make of thee a multitude of people; and will give this land to thy seed after thee, for an everlasting possession.