'Ashes' in the Bible

He feeds on ashes; a deceived heart has turned him aside. And he cannot deliver himself, nor say, “Is there not a lie in my right hand?”

“Is it a fast like this which I choose, a day for a man to humble himself?Is it for bowing one’s head like a reedAnd for spreading out sackcloth and ashes as a bed?Will you call this a fast, even an acceptable day to the Lord?

To grant those who mourn in Zion,Giving them a garland instead of ashes,The oil of gladness instead of mourning,The mantle of praise instead of a spirit of fainting.So they will be called oaks of righteousness,The planting of the Lord, that He may be glorified.