'Ashes' in the Bible

O daughter of my people, put on sackclothAnd roll in ashes;Mourn as for an only son,A lamentation most bitter.For suddenly the destroyerWill come upon us.

“Wail, you shepherds, and cry;And wallow in ashes, you masters of the flock;For the days of your slaughter and your dispersions have come,And you will fall like a choice vessel.

And the whole valley of the dead bodies and of the ashes, and all the fields as far as the brook Kidron, to the corner of the Horse Gate toward the east, shall be holy to the Lord; it will not be plucked up or overthrown anymore forever.”