Charles Ellicott 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. —This should be understood as his words: whether his statement that he belonged to a nation that could only pay such reverence to God would prove true.