'Dust' in the Bible

As many as don't receive you, when you depart from that city, shake off even the dust from your feet for a testimony against them."

'Even the dust from your city that clings to us, we wipe off against you. Nevertheless know this, that the Kingdom of God has come near to you.'

Everyone who falls on that stone will be broken to pieces, but it will crush whomever it falls on to dust."