them: i.e. the restored cities and palaces.
I will multiply. Note the Alternation:. multiply.. not be few.. glorify.. not be despised.
small. small (in number).
Related Commentaries of Jeremiah 30:19
Jeremiah 30:19
19 And out of them shall proceed thanksgiving and the voice of them that make merry: and I will multiply them, and they shall not be few; I will also glorify them, and they shall not be small.