Peace be within thy walls,.... 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 circumstances be what they may, be they high or low, rich or poor, stronger or weaker believers, children, young men, or fathers.