וַיֹּאכְל֣וּ בְנֵֽי־יִשְׂרָאֵ֗ל הַשָּׁבִים֙ מֵֽהַגּוֹלָ֔ה וְכֹ֗ל הַנִּבְדָּ֛ל מִטֻּמְאַ֥ת גּוֹיֵֽ־הָאָ֖רֶץ אֲלֵהֶ֑ם לִדְרֹ֕שׁ לַֽיהוָ֖ה אֱלֹהֵ֥י יִשְׂרָאֵֽל׃
Rashi on Ezra
and whoever separated They are the proselytes, who were separated from the defilement of the nations to cleave to Israel.