Luke emphasizes that the man held on to Peter and John, attaching himself enthusiastically to the men who had brought such a dramatic change into his life. Meanwhile, all the people (cf. 3:9–10 note) ran to them, astonished at what had happened (KJV ‘greatly wondering’ [ekthamboi], echoing v. 10 [thambous, ‘wonder’]).
Jesus is the messianic servant who accomplished God’s saving purposes for Israel and the nations by fulfilling the pattern set out in that prophecy.
By virtue of his death and resurrection, Jesus is the originator of new life for others, as the argument in vv. 16–21 goes on to suggest. His life-giving power has just been powerfully illustrated in the restoration of life to the lame man’s limbs. Although Peter accuses his audience of putting to death the one sent to bring them new life, he proclaims that ‘God raised him from the dead’. God stands in strong contrast to you in v. 14 (cf. 2:23–24; 4:10). God’s saving purposes were not frustrated by Israel’s rebellion but were fully established!
17 A new phase of the sermon’s appeal begins with the words ‘and now’ (kai nyn). As Peter begins to call for a response to his claims, he addresses the people of Jerusalem as ‘brothers’ (adelphoi; TNIV ‘brothers and sisters’), meaning ‘fellow Israelites’ (cf. vv. 12–13). He acknowledges that they ‘acted in ignorance’ (kata agnoian epraxate), as also their leaders did (hōsper kai hoi archontes hymōn). They did not realize who Jesus was, despite his plain words and powerful deeds (cf. Lk. 23:34; 1 Cor. 2:8; 1 Tim. 1:13).
there can be now no genuine turning to God without acknowledging the centrality of Jesus to God’s purpose, as proclaimed in Peter’s message.
Samuel anointed David and spoke of the establishment of his kingdom (e.g., 1 Sa. 13:14; 15:28; 16:13; 28:17), he was declaring God’s intention to save and bless his people through the house of David. Samuel superintended the process by which David was appointed, having earlier declared the pattern of kingship that would fulfill God’s purpose for Israel (1 Sa. 12:13–15).