The Torah portion of Ki Tavo begins by saying: "When you come to the land that G-d your L-rd is giving you as a heritage, occupying and settling it, you shall take of the first fruits...and go to the site that G-d will choose as the place for the indwelling of His name." Rashi comments: "This teaches us that [the Jewish people] were not obligated to bring the first fruits until they conquered and divided the land."
Offering the first fruits served for the Jewish people as a gesture of thanks to G-d for leading them into the Land of Israel and allowing them to enjoy its bounty. It thus indicated that they were not ingrates.
The above is also related to Chai Elul, (the eighteenth day of Elul), which occurred this past week. For it is the birthday of two great luminaries--the Baal Shem Tov, founder of the Chassidic Movement, and Rabbi Shneur Zalman, the founder of the Chabad-Lubavitch segment within that movement. Among the fundamental principles they taught are the obligation to love one's fellow Jew and the concept of the intrinsic unity of the Jewish people which are alluded to at the beginning of this week's Torah portion, the week in which Chai Elul occurs.
How are love and unity among Jews best achieved? When two or more people unite, then no matter how strong their bond may be it is not absolute unity, since they are intrinsically disparate entities; their union is but an extension to their essential being. We thus understand that the unity of the Jewish people, which is an absolutely true and essential unity stems from the fact that all Jews, by virtue of the common Source of their souls, are truly one.
Nevertheless, the true unity of the Jewish people finds expression specifically when Jews, existing as distinct and separate individuals, are even then, truly united as one. Indeed, if the unity of the Jewish people were not to find expression among Jews who exist as distinct individuals, this would prove that their unity does not stem from the essence of their being, for an individual's essence must be found in all his particular and detailed aspects.
This, then, was the deeper reason as to why the Jewish people were not obligated to bring their offerings of the first fruits until they had conquered and divided the land--for it served as an indication of the true and absolute love and unity that existed among them, to the extent that no individual could be truly joyful so long as there existed one fellow Jew who did not yet have a portion in Israel.
And as to ourselves, by truly loving our fellow Jews, we can once again merit to "come to the land" of Israel - through our Righteous Moshiach, speedily in our days.