'Mourning' in the Bible

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.

because during those days the Jews got rid of their enemies. That was the month when their sorrow was turned into rejoicing and their mourning into a holiday. They were to be days of feasting, rejoicing, and of sending gifts to one another and the poor.