As for our redeemer... — The verse comes in somewhat abruptly, but may be viewed (unless we suppose it to have been originally a marginal addition, which has found its way into the text) as Israel’s song of praise, as it looks on the overthrow of Babylon. As such it finds a parallel in the overthrow of the mystical Babylon in Revelation 18:20.
Sit thou silent. — Another contrast between the stir of the rejoicing city and the stillness of its later desolation. “The lady” (we might almost say, the empress) “of kingdoms” was reduced to the loneliness of widowhood.