Job 2:8 KJV

And he took him a potsherd to scrape himself withal; and he sat down among the ashes.
Job 2:8, King James Version

In context

7 So went Satan forth from the presence of the Lord, and smote Job with sore boils from the sole of his foot unto his crown.

8 And he took him a potsherd to scrape himself withal; and he sat down among the ashes.

9 Then said his wife unto him, Dost thou still retain thine integrity? curse God, and die.