2 Bible Verses about Dust, Figurative Use

And whoever will not receive you, nor hear your words, when you go out of that house or that city, shake off the dust from your feet.

And they threw dust on their heads, and cried, weeping and mourning and saying: Alas, alas, that great city, by which all that had ships in the sea became rich by means of costly merchandise! for in one hour she is made desolate.