The Witness of Healing. The man had made a lifestyle out of dependence on others - sitting at the gateway to the Temple, right where people would be thinking about their relationship and "obligation" to God. A prime spot for begging when so much of the Torah and the Prophets exhorted giving to the poor.
Then comes Peter and John...having no silver or gold (not much giving from those 5,000 new converts?), and instead of money for a bill, they give him power to live differently. They dealt with him decisively: "Fixed his gaze upon him" (characteristic of a deliverance), demanded that he look at them, and commanded "In the name of Jesus of Nazareth, walk!" Them he "seized him by the hand" and helped him up.
Well, the people immediately wanted to treat Peter and John like rock stars. But I like Peter's statement, "Why do you gaze at us, as though by our own power and piety we made this man walk?!?" This wasn't for their entertainment - it was to prove that the REAL God had raised up this guy Jesus, whom they had crucified, and that they needed to,
"Therefore repent and return, so that your sins may be wiped away, in order that times of refreshing may come from the presence of the Lord." Acts 3:19-20