Luke 10:13
"Woe unto thee, Chorazin! woe unto thee, Bethsaida! for if the mighty works had been done in Tyre and Sidon, which have been done in you, they had a great while ago repented, sitting in sackcloth and ashes."
Cross References (ranked by relevance)
Job 42:6
Wherefore I abhor myself, and repent in dust and ashes.
Isaiah 61:3
To appoint unto them that mourn in Zion, to give unto them beauty for ashes, the oil of joy for mourning, the garment of praise for the spirit of heaviness; that they might be called trees of righteousness, the planting of the LORD, that he might be glorified.
1 Timothy 4:2
Speaking lies in hypocrisy; having their conscience seared with a hot iron;
Revelation 11:3
And I will give power unto my two witnesses, and they shall prophesy a thousand two hundred and threescore days, clothed in sackcloth.