gospel throughout Jerusalem. The result of this intensive activity is that the membership of the church increased by leaps and bounds. How many Christians belonged to the Jerusalem church is difficult to say. We assume that the church doubled in size from the last figure Luke provided: “five thousand men” (4:4; see also 5:14). Population statistics for first-century Jerusalem are nothing more than estimates. Figures from ancient sources, together with estimates provided by modern scholars, are available.