וּבְכָל־מְדִינָ֨ה וּמְדִינָ֜ה וּבְכָל־עִ֣יר וָעִ֗יר מְקוֹם֙ אֲשֶׁ֨ר דְּבַר־הַמֶּ֤לֶךְ וְדָתוֹ֙ מַגִּ֔יעַ שִׂמְחָ֤ה וְשָׂשׂוֹן֙ לַיְּהוּדִ֔ים מִשְׁתֶּ֖ה וְי֣וֹם ט֑וֹב וְרַבִּ֞ים מֵֽעַמֵּ֤י הָאָ֙רֶץ֙ מִֽתְיַהֲדִ֔ים כִּֽי־נָפַ֥ל פַּֽחַד־הַיְּהוּדִ֖ים עֲלֵיהֶֽם׃
And in every province, and in every city, whithersoever the king’s commandment and his decree came, the Jews had gladness and joy, a feast and a good day. And many from among the peoples of the land became Jews; for the fear of the Jews was fallen upon them.
Tractate Gerim
Anyone who becomes a proselyte for the sake of [marrying a Jewish] woman, or out of fear, or love15[Of the Jews, perhaps deriving material advantage from his conversion.] is not a proselyte. Similarly R. Judah and R. Nehemiah said: All [the Gentiles] who were converted in the days of Mordecai and Esther were not genuine proselytes, as it is stated, And many from among the peoples of the land became Jews; for the fear of the Jews was fallen upon them.16Esth. 8, 17. Anyone who is not converted from purely religious motives17lit. ‘to the name of Heaven’. is not a proselyte. [60b]