Bible Notes Online - Psalms 134 - ESV
Commentary

The final Song of Ascents. The people have arrived; their time is taken up in praising God.

v1: Praise without respite, 1 Chr 9.33. Our work of service continues even "by night," our work remains until we die. No time is inappropriate for worship or service.

v2: Praising God in the sanctuary; the people had reached their goal, and their hearts and hands were lifted up to God.

v3: The Lord will bless those who honour Him.