Verses with the word mordecai's in the Old Testament (2 verses):

Esther 2:22
And the thing was known to Mordecai, who told it unto Esther the queen; and Esther certified the king thereof in Mordecai's name.

Esther 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.