There are two opinions regarding the Menora and Aharon. Last week’s Parsha ended with the twelve נשיאים offering sacrifices during the first twelve days of the functioning of the Mishkan.
According to Rashi, Aharon was disappointed that he had no role to play in the dedication ceremonies. Hashem comforts him by saying that his role is greater. He will be charged with the task of permanently lighting the Menora that will bring light to the world.
The Ramban wrote that Aharon was comforted by Hashem when he was told that his descendants would bring honor to the Jewish people during the Chanukah story.
According to either opinion, Aharon was comforted.