Ezra was devoted to Israel's Law Torah Scroll

Ezra 1-6 recounts the return of the exiles and the rebuilding of the Temple. An edict of king Cyrus of Persia allows Jews to return to Jerusalem, where they rebuild the altar. Despite resistance from local officials and neighboring peoples, they construct a Temple.

Ezra 7-10 tells how Ezra institutes patterns of Jewish life.  Ezra, a scribe knowledgeable in the Law of Moses, denounces mixed marriages, and as a result many Jews divorce their non-Jewish wives.

Ezra 1:1-4 - Cyrus' decree