'Dust' in the Bible

And whoever does not welcome you or listen to your words, shake off the dust from your feet [as you] are going out of that house or [that] town.

And whatever place does not welcome you or listen to you, [as you] go out from there, shake off the dust that is on your feet for a testimony against them."

And [as for] all those who do not welcome you--[when you] depart from that town, shake off the dust from your feet for a testimony against them."

"Even the dust of your town that clings to our feet we wipe off against you! Nevertheless know this: that the kingdom of God has come near!"

So [after] shaking off the dust from [their] feet against them, they went to Iconium.

And [while] they were screaming and throwing off [their] cloaks and throwing dust into the air,

And they threw dust on their heads and were crying out, weeping and mourning, saying, "Woe, woe, the great city, in which all those who had ships on the sea became rich from her prosperity, because in one hour she has been laid waste!"