Psalms 133

1 A Song of degrees of David. Behold, how good and how pleasant [it is] for brethren to dwell together in unity!

It is very good and very pleasant for God’s people to gather together harmoniously.

2 [It is] like the precious ointment upon the head, that ran down upon the beard, [even] Aaron’s beard: that went down to the skirts of his garments;

It is [as delightful as] the precious/expensive ([olive] oil/perfume) that runs down from [the Supreme Priest] Aaron’s head onto his beard [when he is anointed] and runs down onto the collar of his robes.

3 As the dew of Hermon, [and as the dew] that descended upon the mountains of Zion: for there the LORD commanded the blessing, [even] life for evermore.

Gathering together harmoniously [is as delightful] as the dew [that falls] on Hermon [Mountain] and the dew that falls on the hills near Zion [Hill]. Yahweh has promised to bless [his people there in Jerusalem] [by giving them] everlasting (OR, a long-lasting) life.