133:1 A Song of Ascents. Of David. Behold, how good and how pleasant it is For brothers to dwell together in unity!
133:2 It is like the good oil upon the head, Coming down upon the beard, Aaron’s beard, Coming down upon the edge of his robes.
133:3 It is like the dew of Hermon Coming down upon the mountains of Zion; For there, Yahweh commanded the blessing—life forever.
The verse centers on "song", "ascents", "david", "behold", "good", "pleasant", "brothers", and "dwell". It is saying that the verse draws attention to "song" and "ascents", so its meaning should be read from those terms before moving to application.
The local LSB text gives this verse as the immediate unit, so "song" and "ascents" carries the first interpretive weight. In Psalms context, the local focus is worship, trust, the LORD's kingship, and covenant mercy.
A plain takeaway is to answer the verse's own emphasis on "song" and "ascents" with trust shaped by these words, not by a vague optimism outside the passage.