After Moshe takes the concluded Torah scrolls and gives them to the Levi’im (Levites) for safekeeping, he “spoke into the ears of the entire assembly of Israel the words of the following song, until their completion” (31:30). What does the phrase “until their completion” add? Would we think Moshe stopped in the middle of his message/song?
Rav Moshe Feinstein suggests that “until their completion” refers to Moshe conveying the most profound meaning behind the Torah’s laws. Moshe does this not only so that we feel the connection between G-d and us but so that we learn how to convey that relationship to others. Actions can convey love and passion, but only if done with purpose and intent.
