Mark 6:11

11 If any place will not welcome you and they refuse to hear you, as you leave, shake off the dust that is on your feet as a testimony against them."

Mark 6:11 In-Context

9 but to wear sandals and not to put on two tunics.
10 He said to them, "Wherever you enter a house, stay there until you leave the place.
11 If any place will not welcome you and they refuse to hear you, as you leave, shake off the dust that is on your feet as a testimony against them."
12 So they went out and proclaimed that all should repent.
13 They cast out many demons, and anointed with oil many who were sick and cured them.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.