Psalm 133:1 means that shared life among God's people, when marked by unity, is both morally good and deeply pleasant. The verse celebrates more than politeness. In the Songs of Ascents setting, it pictures the beauty of a gathered covenant community living together as one.
Psalm 133 begins with the call to behold the goodness of brothers dwelling together in unity. The rest of the psalm compares that unity to priestly oil and Hermon's dew, ending with blessing from the LORD.
Psalm 133 moves from seeing unity, to comparing it with consecrating abundance, to locating blessing in Zion. The opening verse is the thesis: unity is good and pleasant because it participates in the life and blessing God gives his people.
Psalm 133 is one of the Songs of Ascents, likely associated with pilgrimage or gathered worship in Jerusalem. "Brothers" may refer to literal kin, covenant community, or both. The psalm is short wisdom-like praise of community harmony.
The verse invites readers to value concrete communal life: worship, reconciliation, mutual care, and shared identity. It also challenges communities to pursue unity that is truthful and covenantal, not superficial peacekeeping.
1See how good and how pleasant it is for brothers to live together in unity!