Albert Barnes Commentary Psalms 147:12

"Praise Jehovah, O Jerusalem; Praise thy God, O Zion." — Psalms 147:12 (ASV)

Praise the Lord, O Jerusalem ... - In addition to this general praise in which all may unite, there are special reasons why Jerusalem and its inhabitants should praise God: just as now, in addition to the general reasons pertaining to all people why they should praise God, there are special reasons why Christians—why his redeemed people—should do it. What those reasons, as pertaining to the inhabitants of Jerusalem, were, is specified in the following verses.