Ps 133:2

133:2 like the precious oil. The first simile refers to the anointing of Aaron, the high priest. The special and exclusive blend of oil (Ex. 30:22–33) was poured out extravagantly, running down his beard and onto his sacred robes. In the same way the unity of the people of God is a rich perfume making their worship pleasing to Him (Rom. 15:6).