Charles Ellicott Commentary Jeremiah 33:11

"the voice of joy and the voice of gladness, the voice of the bridegroom and the voice of the bride, the voice of them that say, Give thanks to Jehovah of hosts, for Jehovah is good, for his lovingkindness [endureth] for ever; [and of them] that bring [sacrifices of] thanksgiving into the house of Jehovah. For I will cause the captivity of the land to return as at the first, saith Jehovah." — Jeremiah 33:11 (ASV)

The voice of joy, and the voice of gladness ... — The words gain greater emphasis because they are the same ones the prophet himself used (Jeremiah 7:34, Jeremiah 16:9, Jeremiah 25:10) in foretelling the city's desolation. He points, so to speak, by implication to the fulfillment of the one prediction, as a guarantee that the other also will, in due season, have its fulfillment.

Praise the Lord of hosts ... — The words were used as the ever-recurring doxology of the Temple services (Ezra 3:11, 2 Chronicles 7:6, 2 Chronicles 20:21, Psalms 136:2–3, 1 Maccabees 4:24). The Courts of the Temple, now hushed in silence, would once again re-echo with the Hallelujahs of the Priests and Levites. The sacrifice of praise (the same phrase as in Jeremiah 17:26 and Psalms 56:12) may be either “the sacrifice which consists in praise,” or the “sacrifices of thanksgiving” of Leviticus 7:12, which were offered in acknowledgment of special blessings.

The ground of the thanksgiving in either case would be that the Lord had turned again the captivity of Jacob. The phrase was a familiar one, as in Psalms 14:7, Psalms 53:6, and Deuteronomy 30:3. The words as at the first (literally, as at the beginning) do not refer to any previous restoration, like that of the Exodus from Egypt, but to the state before the exile.