2 Bible Verses about Dust, Figurative Use

And whosoever shall not receive you, nor hearken to your words; when ye come out of that house or city, shake off the very dust of your feet:

And they threw dust on their heads, and cried out, weeping and moaning, saying, Alas, alas, that great city, in which all that had ships at sea were enriched by her sumptuous expences! for in one hour she is become desolate.