Note: The Psalm is in three part with a refrain to do with the holiness of YHWH, after each section. The first section describes the Lord as king reigning from the mercy seat. The second section focuses on the king aspect, the third upon the priestly aspect. 

A1. 1 The LORD reigneth; let the people tremble:
he sitteth between the cherubims; let the earth be moved.
2 The LORD is great in Zion; and he is high above all the people.

B1. 3 Let them praise thy great and terrible name; for it is holy.

A2. 4 The king’s strength also loveth judgment;
thou dost establish equity,
thou executest judgment and righteousness in Jacob.

B2.  5 Exalt ye the LORD our God,and worship at his footstool;
for he is holy.

A3.  a. 6 Moses and Aaron among his priests,
and Samuel among them that call upon his name;

b. they called upon the LORD, and he answered them.

c. 7 He spake unto them in the cloudy pillar:
they kept his testimonies, and the ordinance that he gave them.

b’. 8 Thou answeredst them, O LORD our God:

a’. thou wast a God that forgavest them,
though thou tookest vengeance of their inventions.

B3.  9 Exalt the LORD our God,and worship at his holy hill;
for the LORD our God is holy.

Note: vv 6 and 8 pair Moses, Aaron and Samuel with forgiveness. Moses and Samuel especially are known for interceding with God to forgive Israel.