Rabbi Yuda bar Simon and Rabbi Ḥanin in the name of Rabbi Yoḥanan: It is written: “Come behold the works of the Lord…” (Psalms 46:9) – the Holy One blessed be He caused masters to become angry at their servants to grant prominence to the righteous: “Pharaoh became angry at his servants” (Genesis 41:10) – to grant prominence to Joseph. [And He caused] servants [to become angry] at their masters in order to grant prominence to the righteous: “Bigtan and Teresh became angry” (Esther 2:21) – to grant prominence to Mordekhai.
Rabbi Yudan was speaking about these actions of Bigtan and Teresh. Rav said: They placed a short dagger in their shoes. Rabbi Ḥanin said: They prepared an apparatus to strangle him. Shmuel said: They placed serpent’s venom in his cup.
“The matter was investigated, and was discovered” (Esther 2:23). The Rabbis say: They placed a fly in his goblet;6This was a poisonous fly (Etz Yosef; cf. Rabbi David Luria). immediately, “the matter was investigated, and was discovered.”