Vayelech

On that day, Moshè wrote down this song, and he taught it to the Israelites" (31:22)
The Baal Shem Tov taught that when the Messiah arrives, he will explain the entire Torah from the perspective of each and every letter, starting from the first letter of the Torah to the last. Then he will join all the letters together into one long Name of G-d and explain the entire Torah from the total perspective. Meaning to say, first he will explain the Torah according to the unique view of every individual, so that each one will hear an explanation of Torah that rings harmoniously with the root of his soul. Then he will join all the letters together, and reveal the unity of the entire Jewish People through the Torah.

(Eliezer Shore-Bas Ayin)