Esther 2:5

2:5 [Now] in Shushan the palace there was a certain Jew, whose name [was] Mordecai, the son of Jair, the son of Shimei, the son of Kish, a Benjamite;

Esther 3:4

3:4 Now it came to pass, when they spake daily unto him, and he hearkened not unto them, that they told Haman, to see whether Mordecai’s matters would stand: for he had told them that he [was] a Jew.