daf bit: Megilah 13

Early in the book of Esther we're told of a plot by Bigtan and Teresh, two royal servants, who intended to kill the king. Mordechai overheard the plot and reported it, ultimately earning a (delayed) reward. The rabbis explain: the Holy One, blessed be He, caused the servants to be angry with the king so that a miracle could be done for a righteous man, Mordechai. R. Yochanan said: Bigtan and Teresh were two Tarseans and conversed in the Tarsean language. They said: from the day this woman (Esther) came we have been unable to get any sleep, as the king demands our attendance at all times. Let us poison his food so he will die. They were unaware that Mordechai, who had a seat on the Sanhedrin (!), spoke 70 languages, and thus they were caught. (13b)