shake the dust from (one's) feet
To forsake someone, something, or some place as an expression of rejection or as a means of seeking a new beginning. There comes a point in most people's lives when they feel get tired of their job and yearn to shake the dust from their feet. If you find that the people in your life are causing more negativity than positivity, it might be time to leave them behind and shake the dust from your feet.
shake the dust from one's feet
Depart in a hurry, especially from an unpleasant situation; also, leave forever. For example, I couldn't wait to shake the dust from my feet; I never wanted to see either of them again . This metaphoric term, alluding to moving one's feet fast enough to shake off dust, appears in several books of the Bible. [c. 1600]