When Mordecai learned all that had occurred, he tore his clothes, put on sackcloth and ashes, went into the middle of the city, and cried loudly and bitterly.
References for Esther 4:1
He only went as far as the King's Gate, since [the law] prohibited anyone wearing sackcloth from entering the King's Gate.
There was great mourning among the Jewish people in every province where the king's command and edict came. They fasted, wept, and lamented, and many lay on sackcloth and ashes.
References for Esther 4:3
Esther's female servants and her eunuchs came and reported the news to her, and the queen was overcome with fear. She sent clothes for Mordecai to wear so he could take off his sackcloth, but he did not accept [them].
Esther summoned Hathach, one of the king's eunuchs assigned to her, and dispatched him to Mordecai to learn what he was doing and why.
References for Esther 4:5
So Hathach went out to Mordecai in the city square in front of the King's Gate.
Mordecai told him everything that had happened as well as the exact amount of money Haman had promised to pay the royal treasury for the slaughter of the Jews.
References for Esther 4:7
Mordecai also gave him a copy of the written decree issued in Susa ordering their destruction, so that Hathach might show it to Esther, explain it to her, and instruct her to approach the king, implore his favor, and plead with him personally for her people.
Hathach came and repeated Mordecai's response to Esther.
Esther spoke to Hathach and commanded him to tell Mordecai,
"All the royal officials and the people of the royal provinces know that one law applies to every man or woman who approaches the king in the inner courtyard and who has not been summoned-[the] death [penalty]. Only if the king extends the golden scepter will that person live. I have not been summoned to appear before the king for the last 30 days."
References for Esther 4:11
Esther's response was reported to Mordecai.
Mordecai told [the messenger] to reply to Esther, "Don't think that you will escape the fate of all the Jews because you are in the king's palace.
If you keep silent at this time, liberation and deliverance will come to the Jewish people from another place, but you and your father's house will be destroyed. Who knows, perhaps you have come to the kingdom for such a time as this."
References for Esther 4:14
Esther sent this reply to Mordecai:
"Go and assemble all the Jews who can be found in Susa and fast for me. Don't eat or drink for three days, night and day. I and my female servants will also fast in the same way. After that, I will go to the king even if it is against the law. If I perish, I perish."
So Mordecai went and did everything Esther had ordered him.