1)
?Vayaged Moshe le?Aharon es Kol Divrei Hashem ? ?. What is ?Kol Divrei Hashem ..." coming to include?
1.
Ramban #1 and R. Bachye: Moshe related to Aharon the entire contents of his communication with Hashem by the burning bush - including his refusal to undertake the Shelichus, and that ultimately, he was sent against his will.
2.
Ramban #2 and R. Bachye #2: (citing Midrash Chazis): He taught him the Names of Hashem. 1
1
As discussed earlier (See 3:14-15). See also R. Bachye.