NET
15 In those days Peter stood up among the believers (a gathering of about 120 people) and said,
Darby
15 And in those days Peter, standing up in the midst of the brethren, said, (the crowd of names [who were] together [was] about a hundred and twenty,)
KJV
15 And in those days Peter stood up in the midst of the disciples, and said, (the number of names together were about an hundred and twenty,)