Verse 15
In view of Peter’s leadership gifts, so obvious in the Gospels, it is no surprise that he is the one who took the initiative on this occasion.
"Undoubtedly, the key disciple in Luke’s writings is Peter. He was the representative disciple, as well as the leading apostle. [Note: Darrell L. Bock, "A Theology of Luke-Acts," in A Biblical Theology of the New Testament, p. 148.]
"Brethren" is literally "disciples" (Gr. matheton). The group of 120 that Peter addressed on this occasion (cf. Acts 1:13-14) was only a segment of the believers living in Jerusalem at this time (cf. 1 Corinthians 15:6, which refers to more than 500 brethren). Nonetheless this was a tiny group from which the church grew. God can take a small number of people, multiply them, and eventually fill the earth with their witness.
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