Psalms 122:7

“Peace be within thy walls, etc.] The word say might be supplied; for this, with the following, seem to be petitions the psalmist puts into the mouths of those he desires to pray for Jerusalem’s peace; and he directs them to pray in this manner, to take with them such words as these, and pray to the Lord. Jerusalem was a walled city, and so is the church of God; God himself is a wall of fire around her; salvation by Christ is as walls and bulwarks to her; the power and providence of God protect her: within these walls the people of God have a place and a name; all the inhabitants of Zion in common are included in this petition, and peace is wished for them all; let their condition and…”

“Peace be within thy walls - The word here rendered walls, means properly an host, an army; then a fortification, an entrenchment, especially the ditch or trench with the low wall or breastwork which surrounds it. Gesenius, Lexicon. It refers here to the fortifications or defenses around Jerusalem. And prosperity - Peace; the same word which is used in the previous verse, and expressing the same idea - that of tranquility. Within thy palaces - This word properly means a “fortress,” “castle;” then, a palace, a residence of a king or a prince, 1 Kings 16:18; 2 Kings 15:25; Isaiah 25:2. The idea is, that such places abounded in Jerusalem; and the prayer is, that in those abodes of power, where…”

“Peace: Ch1 12:18; Isa 9:7, Isa 54:13; Joh 14:27; Jam 3:18 within thy palaces: Psa 48:3 Psalms 122:8”