Because of this, Aaron merited אורים ותומים: the ornament of the breastplate, which is placed over the heart.’ The parshanim expound:Hashem said this to Moshe, to put his mind at rest ...

As it is said, ‘And Aaron shall bear the names of the Israelites on the breastplate on his heart’” [Midrash Tanhuma]. Because of this capacity to rejoice wholeheartedly in another’s good ...