'Ashes' in the Bible

Now when Mordecai found out all that was done, Mordecai tore his clothes, and put on sackcloth with ashes, and went out into the midst of the city, and wailed loudly and a bitterly.

In every province, wherever the king's commandment and his decree came, there was great mourning among the Jews, and fasting, and weeping, and wailing; and many lay in sackcloth and ashes.