In dust and ashes

with humble expression of grief or repentance; - from the method of mourning in Eastern lands.
See under Ashes.

See also: Ashes, Dust

References in periodicals archive ?
T]herefore I despise myself, / and repent in dust and ashes.
From now on I shall live with remorse, in dust and ashes.
s translation, in which Job despises himself and repents in dust and ashes, seems insupportable both because of its questionable insertion of the reflexive pronoun and because of its inability to explain the text's final outcome.