Acts 3: faith in the name of Jesus

Peter and John met a crippled beggar in the temple. He asked for money.

6 But Peter said, “I do not have silver and gold, but what I do have I give to you: In the name of Jesus Christ the Nazarene, walk!”

Peter and John had a great treasure: Jesus. We are naturally selfish; as we are rich we become afraid to share our wealth, but here it is different.

The man was healed and then, he praised the Lord.
Everybody was marveled. Peter made a speech where he talked about Jesus's death. He reminded that his listeners were guilt given that they asked for the release of Barabbas instead of Jesus. However, the name of Jesus is precious. Peter said:

16 And on the basis of faith in His name, it is the name of Jesus which has strengthened this man whom you see and know; and the faith which comes through Him has given him this perfect health in the presence of you all.

The crippled beggar trusted in the name of Jesus and was healed by Him. Peter said that Jesus was in the center of the Old Testament. 
To a Jew in Jerusalem, Jesus was crucified and was cursed by the Lord, but now, Peter (who denied Jesus) is proclaiming that Jesus is the Messiah, the one pointed by the Scriptures.
As it all happened in the temple, the Jewish leaders knew about this. They were against Jesus and against the message of the apostles, but how to deal with this great sign?