Jeremiah 30:19 - Matthew Poole's English Annotations on the Holy Bible

Out of them shall proceed thanksgiving; thanksgiving to God, as Jeremiah 17:26, either thank-offerings, Leviticus 7:12,13, or vocal thanksgivings. And the voice of them that make merry; either in a religious sense, or in a civil sense if it be taken in the former, it signifieth their mirth at their religious festivals, of which we read much in Scripture, Psalms 42:4, Psalms 118:15, &c.; if in the latter, it signifieth their happy and joyful state after their restoration. I will multiply them, and they shall not be few; though they be diminished in the captivity, yet I will return to them in my wonted providences, and multiply them according to my promise to Abraham, so as they shall be for number many. I will also glorify them, and they shall not be small; and as to their quality, it shall be honourable; though during those seventy years they shall be a people of mean or no reputation, yet after that time they shall recover their ancient reputation, and again be a people great for honour and glory.