John Chrysostom
That is, they insulted him and attacked him. So they acted. And what does Paul do? He leaves them, and with a great threat. He no longer says, "It was necessary that the word of God should first be spoken to you" (Acts 13:46). He also turns to them with an outward sign: "But when they opposed and blasphemed, he shook out his garments and said to them, 'Your blood be upon your heads; I am clean. From now on I will go to the Gentiles.'"
See how, after saying again, "From now on," he nevertheless does not cease caring for them. Therefore he said this in order to rouse them. Then he went to Justus, whose house was next to the synagogue.
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He settled in a neighboring house so that this very nearness might stir up zeal in them, if they wished. "But when they opposed and blasphemed," he withdrew. He withdrew, hoping in this way to convert them more quickly.
Why, indeed, after leaving that house, did he settle closer to the synagogue? Was it not for this reason? He saw no danger even there. "To testify," it says, to them. He no longer teaches, but testifies.
"But when they opposed," it says, "and blasphemed, he shook out his garments and said to them, 'Your blood be upon your heads.'" He does this in order to frighten them not only by word, but also by deed. He speaks to them with greater force, as one who had already persuaded many.
"I," he says, "am clean." "From now on I will go to the Gentiles." So also we are guilty of the blood of those entrusted to us if we neglect them. Likewise, when he says, "From now on let no one trouble me" (Gal 6:17), he says it to frighten them. The punishment could not frighten them so much as this threat.