8 Then Peter, filled with the Holy Spirit, said to them, "Rulers and elders of our people, 9 are we being questioned today because we've done a good deed for a crippled man? Do you want to know how he was healed? 10 Let me clearly state to all of you and to all the people of Israel that he was healed by the powerful name of Jesus Christ the Nazarene, the man you crucified but whom God raised from the dead. 11 For Jesus is the one referred to in the Scriptures, where it says, 'The stone that you builders rejected has now become the cornerstone.' 12 There is salvation in no one else! God has given no other name under heaven by which we must be saved."
Matthew Henry's Commentary on Acts 4:8-12
Commentary on Acts 4:5-14
(Read Acts 4:5-14)
Peter being filled with the Holy Ghost, would have all to understand, that the miracle had been wrought by the name, or power, of Jesus of Nazareth, the Messiah, whom they had crucified; and this confirmed their testimony to his resurrection from the dead, which proved him to be the Messiah. These rulers must either be saved by that Jesus whom they had crucified, or they must perish for ever. The name of Jesus is given to men of every age and nation, as that whereby alone believers are saved from the wrath to come. But when covetousness, pride, or any corrupt passion, rules within, men shut their eyes, and close their hearts, in enmity against the light; considering all as ignorant and unlearned, who desire to know nothing in comparison with Christ crucified. And the followers of Christ should act so that all who converse with them, may take knowledge that they have been with Jesus. That makes them holy, heavenly, spiritual, and cheerful, and raises them above this world.