How were the Yetzikah and the Meshichah performed?
Rashi: Moshe first poured oil on Aharon's head; then he placed oil between his eye-lashes and joined it to them with his finger.
Why does the Torah not mention the anointing of Aharon's sons? Moshe was commanded to do so (Shemos 40:15)!
Ramban #1, Moshav Zekenim (10) #1: It can be taken for granted that Moshe anointed Aharon's sons. 1
Ramban #2, Moshav Zekenim (10) #2: It does not record it because it did not take place. Moshe was commanded to sprinkle the anointing oil on them and on their clothes, but not to anoint them. 2
Ramban, Moshav Zekenim: Based on the fact that Hashem commanded him to do so (see also Shemos 28:41), and it says (Pasuk 13) that Moshe did like he was commanded.