Charles Ellicott Commentary Psalms 135:21

"Blessed be Jehovah out of Zion, Who dwelleth at Jerusalem. Praise ye Jehovah." — Psalms 135:21 (ASV)

Out of Zion. —As in Psalms 128:5, Jehovah blesses the covenant people out of Zion, so here they bless him out of Zion—that is the place where the reciprocal relation is best and chiefly realised. This localisation is made more emphatic by the addition of the name Jerusalem to Zion. (Psalms 125:1–2.)