Moses's Approach Towards Death
Several commentaries interpret Moses's going to the people before his death.
Moses's going as an indication of a change in his status
Chizkuni (Chizkiya ben Manoach, mid 13th century) notes that Moses goes to the people, instead of assembling them by sounding the trumpets (Numbers 10:1-10). This is because (Midrash Tanchuma Beha'alotecha 10), as Moses was about to die Hashem took the trumpets, which symbolized Moses's role as ruler, and concealed them, since "there is no dominion on the day of death" (Ecclesiastes 8:8). Moses's "going" indicates his loss of dominion.
The Targum (translation of the Torah into Aramaic), ascribed to Yonatan ben Uziel, interpolates:
And Moses went to the Tabernacle bet Midrash. Moses goes to the House of Study to transfer his authority to Joshua.
Moses's going as a method of instruction
Sforno (Ovadia ben Yaakov Sforno, c. 1470-c.1550) does not translate vayelekh as and he went/walked, but as "he bestirred himself, took the initiative," as in:
And there went a man from the house of Levi (Exodus 2:1).
And he went and worshipped (Deuteronomy 17:3).
Moses roused himself to comfort his people in the face of his imminent death, so they would accept the covenant he had just taught them in joy.
Finally, Keli Yakar (Ephraim Shlomo of Luntshitz, 1550-1619) offers two explanations for Moses's going, one to indicate a change in Moses, and one to bring about a change in the people:
1) Vayelekh means "and he walked about," without reference to his point of departure or destination. Since lo uchal (verse 2) could mean either "I am not able" or "I am not permitted," Moses needs to make it clear that it is not that Moses is physically unable; at the time of his death "his eye was not dimmed nor was his freshness departed" (Deuteronomy 34:7). Rather, he is not permitted to lead; leadership has been transmitted to Joshua. Therefore, he walked about vigorously, showing them that he is still as capable as ever, despite his age of 120.
Actually, this idea is reflected in Rashi: I am not able any longer to go out and to come in matters of halakha (Jewish law), for the sources of wisdom have been closed to him. Moses walks about to demonstrate his loss of authority and Divine inspiration.
2) Vayelekh means "and he approached." Furthermore, "and he spoke these words to all of Israel" refers to the previous passage about the importance and accessibility of repentance (Ch. 30); "words" often alludes to repentance, as in the beginning of the book of Deuteronomy and "Take with you words and return to Hashem" (Hoshea 14:3). Before his death, Moses wishes to motivate the people to repentance. However, since most people do not recognize their own faults, he needs to approach them to inspire repentance.
Keli Yakar sees Moses's assertiveness as influenced by a desire for peace; he develops his thesis that we are obligated to pursue peace actively (Vayikra Rabba 9:9), because peace benefits all parties concerned, and, ultimately, our collective connection to Hashem.
On the threshold of a new chapter in Israel's history on the threshold of a new year Moses goes ahead, teaching Israel how to face the future.
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