Ezra was a scholar in the study of the Law of Moses. He was a priest and a scribe who helped to lead the Israelites back to Jerusalem from Babylonian captivity. Ezra was well-versed in the Scriptures and the Law of Moses, which he studied and taught to the people. He played a vital role in the restoration of the Jewish community and their religious practices, which had been disrupted during their exile. Therefore, we can conclude that Ezra was a scholar in the study of the Law of Moses, not the history or politics of Persia, nor the religious law of Hammurabi.