2 Bible Verses about Dust, Figurative Use

And if any one will not receive you or listen to your words, shake off the dust from your feet when you leave that house or town.

And they threw dust on their heads and were crying out, weeping and mourning, saying, 'Woe, woe, the great city, where all who had ships at sea became rich by her wealth, for in one hour she has been laid waste!'