Commentary for Kiddushin 139:2
גירי וחרורי מנלן אמר רב חסדא דאמר קרא (עזרא ו, כא) וכל הנבדל מטומאת גויי הארץ אליהם
MAMZERIM. How do we know it? - Because it is written: And Sanballat the Horonite, and Tobiah the slave, the Ammonite, heard it:<span class="x" onmousemove="('comment',' Neh. II, 10.');"><sup>2</sup></span> and it is [also] written, [Moreover in those days the nobles of Judah sent many letters unto Tobiah.] For there were many in Judah sworn unto him, because he [Tobiah] was the son-in-law of Shechaniah the son of Arah; and his son Jehohanan had taken the daughter of Meshullam the son of Berchiah to wife.<span class="x" onmousemove="('comment',' Ibid. VI, 17f. Shechaniah was a Jew.');"><sup>3</sup></span>
Daf Shevui to Kiddushin
The verse shows that there were Jews who came to Eretz Yisrael who had separated themselves from the nations. This could have been done either through conversion or being freed.
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