Expositor's Bible Commentary Commentary Acts 1:15

"And in these days Peter stood up in the midst of the brethren, and said (and there was a multitude of persons [gathered] together, about a hundred and twenty)," — Acts 1:15 (ASV)

In keeping with his character portrayal of Peter throughout his gospel, Luke here presents Peter as taking the lead among the apostles. The word “believers” here is usually “brothers” (GK 81), a term that Luke frequently uses for Christian believers but also has just used for the blood “brothers” of Jesus.