John Gill Commentary Psalms 135:2

"Ye that stand in the house of Jehovah, In the courts of the house of our God." — Psalms 135:2 (ASV)

You that stand in the house of the Lord
That have a place and standing there, and go not out, being sons as well as servants; (See Gill on Psalms 134:1) and (See Gill on Psalms 84:4);

in the courts of the house of our God ;
alluding to the courts in the temple, the court of the priests, where they stood and ministered, slaying and offering their sacrifices; and the great court, where all the Israelites stood and worshipped, (2 Chronicles 4:9) . So this may describe the worshippers of God in common, who should praise him: and happy are they that have a place here; see (Psalms 84:1Psalms 84:2Psalms 84:10) .