Hechos 4:4

4. Many Who as Jerusalemites had probably been acquainted personally with Jesus and his history, and as regular temple worshippers were religiously disposed. The author of “Ecce Homo” well remarks that probably nearly all the moral worth at this epoch in Jerusalem went into the Christian Church.

Five thousand Adding since Pentecost two thousand men, without enumerating females and children. So that the body of actually professing believers may have been ten or twelve thousand. The number of Christians then was nearly as large as the present entire population of Jerusalem!