And all the people saw him walking and praising God:

People's New Testament

3:9,10 The people... were filled with wonder. They had often seen the lame beggar, but now saw him walking, and leaping and praising God (Ac 3:8), and did not know how he had been healed.

Jamieson-Fausset-Brown Bible Commentary

9. all the people saw him, &c.-as they assembled at the hour of public prayer, in the temple courts; so that the miracle had the utmost publicity.

Matthew Henry's Concise Commentary

3:1-11 The apostles and the first believers attended the temple worship at the hours of prayer. Peter and John seem to have been led by a Divine direction, to work a miracle on a man above forty years old, who had been a cripple from his birth. Peter, in the name of Jesus of Nazareth, bade him rise up and walk. Thus, if we would attempt to good purpose the healing of men's souls, we must go forth in the name and power of Jesus Christ, calling on helpless sinners to arise and walk in the way of holiness, by faith in Him. How sweet the thought to our souls, that in respect to all the crippled faculties of our fallen nature, the name of Jesus Christ of Nazareth can make us whole! With what holy joy and rapture shall we tread the holy courts, when God the Spirit causes us to enter therein by his strength!