Psalm 133/Overview/Background

• The valuable oil (שֶּׁמֶן הַטֹּוב) in Ps 133 is used to denote "the oil for anointing described in Exod 30:22-23, which consisted of a mixture of oil and aromatic spices strictly forbidden to be used in common life." This oil was associated exclusively with priestly service
• Zion, another name for Jerusalem, was where the Temple was located and was considered the meeting place between heaven and earth (cf. Pss 2:6; 78:68-69). It was also where the Israelites made the pilgrimage a few times a year for the holy festivals commanded by YHWH (Lev 23).
• Aaron was the first high priest in Israel, and he serves as a symbol for the office of high priest. "Through the priestly institution the Lord assured his people of forgiveness and blessing (Exod 29:44–46; Lev 9:22–24; Num 6:24–26).”
• When YHWH established his covenant with the people in the wilderness, this covenant involved blessings (≈ life) for covenant faithfulness and curses (≈ death) for covenant unfaithfulness (Deut 28-30).
• Mount Hermon was the highest mountain of the land of Israel, located in the far north, "known for its abundant dew," and thus an important water source for the arid land. Because Hermon is located hundreds of kilometers north of Jerusalem, the dew of Hermon flowing to the mountains of Zion is a geographical and meteorological impossibility. Rather, the figurative image of dew flowing from the far northern mountain of Hermon all the way to the arid southern mountains of Zion depicts both the volume and extent of God's blessings. His life-giving power, characterized by dew, covers and nourishes the entire land. Additionally, like the dew, brothers will gather in Zion from all over the country to worship God together, an event which is itself a blessing.