Shared ground
These lines function as a closing liturgical roll call. The text explicitly summons distinct groups—“house of Israel,” “house of Aaron,” “house of Levi,” and “you who fear Yahweh”—to praise Yahweh. It then shifts to a spoken blessing tied to Zion and Jerusalem, and ends with “Praise Yah.”
The passage assumes a worshiping community with recognizable roles. Priests (Aaron) and Levites are not separated from the wider people; they are named within the same chorus of praise. The final blessing locates this praise “from Zion” and describes Yahweh as the one who “dwells at Jerusalem,” using temple-centered language.
Where interpretation differs (only where needed)
Two phrases invite more than one reasonable reading.
1) Who are “those who fear Yahweh”? The phrase can mean faithful Israelites described by reverence. It can also be read more broadly as including non-Israelites who worship Israel’s God, since “fear Yahweh” can function as a general label for reverent worshipers.
2) What does it mean that Yahweh “dwells at Jerusalem”? Some take this as a strong claim about Yahweh’s special, real presence associated with the temple. Others read it mainly as covenant-and-worship language: Jerusalem is the recognized center for Israel’s public worship, without implying that Yahweh is confined to a location.
Why the disagreement exists
The wording is short and poetic. Terms like “house” can point to family lines, professional groups, or the worshiping community as a whole. Likewise, “from Zion” can mean “in Zion” (the place where blessing is spoken) or “out of Zion” (blessing spoken from Zion toward others). And “dwells” can be read either more literally (special presence) or more symbolically (recognized center of worship).
What this passage clearly contributes
It closes Psalm 135 by gathering the entire worshiping community—laity, priests, Levites, and all reverent worshipers—into one unified act of praise. It also links that praise to Zion/Jerusalem as the public focal point of Israel’s worship identity. The final “Praise Yah” underscores that the psalm’s goal is communal, spoken praise rather than private reflection.