Charles Ellicott Commentary Psalms 135:1

"Praise ye Jehovah. Praise ye the name of Jehovah; Praise [him], O ye servants of Jehovah," — Psalms 135:1 (ASV)

The psalm opens with an adaptation and expansion of Psalms 134:1. As there, the priestly class is addressed. Some, however, think that the addition, “courts of the house of our God,” as well as Psalms 135:19, apply to all those standing in covenant relation to Jehovah. This is possible, but not proved by the evidence presented.