The Lord is the holy and righteous King (Isa 6:1–5). Mount Zion, the location of the Lord’s Temple, metaphorically stands as the highest point on earth (Ps 113:4; Isa 2:2; 6:1). From this summit, the Great King (Ps 47:2) can see, rule over, and receive praise from all nations and peoples.
The psalmist calls the nations to worship the Lord, the king of the earth who rules from Zion.
God showed favor by responding to his people in the past, while holding sinners accountable.