A Song of Ascents of David. Behold, how good and how pleasant it is for brothers to dwell together in unity. It is like the precious oil upon the head, coming down upon the beard, even Aaron's beard, coming down upon the edge of his robes. Our sages taught that the drops of the anointing oil were like two pearls hanging from Aaron's beard.
Rav Pappa said, when he would recount the burnt offerings and the chanced-upon contributions of the leaders who sat before him, he was careful about his phrasing. Moses, too, was careful when he said "Lest I be anointed," for he feared the "anointed ones" (i.e. Aaron and his sons). A Heavenly Voice emerged and declared, "Like the dew of Hermon descending upon the mountains of Zion, for there Hashem ordained the blessing of everlasting life."
Even though Aaron was concerned that perhaps Moses did anoint himself instead of Aaron, a Heavenly Voice emerged and declared, "Behold, how good and how pleasant it is for brothers to dwell together in unity, for there is no anointing oil upon the head that is as precious as this oil, nor is there any cloak that is as precious as this cloak." For all good deeds and consolations come from Zion.