Chapter 99

1st Stanza, The Lord reigns.  This verse:

[Psa 99:1 ESV] 1 The LORD reigns; let the peoples tremble! He sits enthroned upon the cherubim; let the earth quake!

This is the second time I have seen the cherubim.  The first time, God was riding on one, now his thrown is on one.  MSB says this is a reference to the Ark of the Covenant.  Of course!  Two cherubim on the top of the Ark.  That's where God was.

Also, the phrase "Holy is he" is repeated twice in this stanza.

2nd, Moses, Aaron, and Samuel were his priests. 

3rd, The Lord was their God.  Last phrase is "...for the Lord our God is holy!"