11 God did powerful things through Paul, things quite out of the ordinary. 12 The word got around and people started taking pieces of clothing - handkerchiefs and scarves and the like - that had touched Paul's skin and then touching the sick with them. The touch did it - they were healed and whole.
Matthew Henry's Commentary on Acts 19:11-12
Commentary on Acts 19:8-12
(Read Acts 19:8-12)
When arguments and persuasions only harden men in unbelief and blasphemy, we must separate ourselves and others from such unholy company. God was pleased to confirm the teaching of these holy men of old, that if their hearers believed them not, they might believe the works.