Albert Barnes Commentary 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." — Esther 3:4 (ASV)

Whether Mordecai’s matters would stand - Rather, “whether Mordecai’s words would be accepted as valid” — whether, that is, his excuse, that he was a Jew, would be allowed as a valid reason for his refusal.