This was according to our Saviour's command, Matthew 10:14 Mark 6:11 Luke 9:5, so often is it mentioned, and so considerable a matter it is for us to know, and dread the punishment appointed for such as refuse the gospel, and contemn the salvation offered by it. What this was symbolical of is not expressed. The Hebrew proverb says, The dust of an ethnic city or country doth pollute a man; and they might by this represent, that the inhabitants of such a city or place, who did not entertain the gospel, and the ministers thereof, they would repute as the vilest sinners, and they should by God be dealt with accordingly. Iconium: see Acts 14:1.
Related Commentaries of Acts 13:51
Acts 13:51
51 But they shook off the dust of their feet against them, and came unto Iconium.