Also:
I am but dust and ashes
Genesis 18:27
And Abraham answered and said, Behold now, I have taken upon me to speak unto the Lord, which am but dust and ashes:
Job 30:19
He hath cast me into the mire, and I am become like dust and ashes.
Job 42:6
Wherefore I abhor myself, and repent in dust and ashes.
Ezekiel 27:30
And shall cause their voice to be heard against thee, and shall cry bitterly, and shall cast up dust upon their heads, they shall wallow themselves in the ashes: