Mark 6:11

6:11 If a place will not welcome you or listen to you, as you go out from there, shake the dust off ¹  your feet as a testimony against them.”

Mark 14:21

14:21 For the Son of Man will go as it is written about him, but woe to that man by whom the Son of Man is betrayed! It would be better for him if he had never been born.”

[6:11]  ¹ sn To shake the dust off represented shaking off the uncleanness from one’s feet; see Luke 10:11; Acts 13:51; 18:6. It was a sign of rejection.