From the early Church Fathers to now.
1 Jewish · 1 Reformed · 1 Methodist · 1 Catholic
“And Mardochai had notice of it, and immediately he told it to queen Esther: and she to the king in Mardochai’s name, who had reported the thing unto her.”
“And the matter became known to Mordecai For they were discussing their affairs before him in the Tarsean language, and they did not know that Mordecai was familiar with seventy languages, for he was one of those who sat in the Chamber of Hewn Stone.”
“And the thing was known to Mordecai,.... But by what means does not appear; the Jewish writers say (c), these two men were Tarsians, and spoke in the Tarsian language, which they thought Mordecai did not understand; but he, being skilled in languages, overheard them, and understood what they said; but, according to Josephus (d), it was discovered to him by Barnabazus, a servant of one of the chamberlains; the latter Targum says, it was showed unto him by the Holy Ghost: who told it unto Esther, and Esther certified the king thereof in Mordecai's name; whose name she mentioned, partly as a voucher of the truth of what she reported, and partly to ingratiate Mordecai to the king, that he might be still yet more promoted in due time. (c) T. Bab. Megillah, fol. 13. 2. Targum prius & Jarchi in loc. (d) Antiqu. l. 11. c. 6. sect. 4.”
“Was known to Mordecai - Josephus says that a Jew, named Barnabasus, overheard the plot, told it to Mordecai, Mordecai to Esther, and Esther to the king, in Mordecai's name; and he was registered as the discoverer.”
“Notice of it, from Barnabaz, a Jew in the service of one of them. (Josephus [Antiquities?] xi. 6.) — He might also hear some suspicious words. (R. Calom.) (Worthington)”
The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.