We now enter on the narrative of the time which followed the Ascension, limiting ourselves as far as possible to those parts of St Luke's record which illustrate the characteristics of the new Ecclesia and the stages of its growth; but not neglecting either pieces of evidence relating to the Ecclesia under other names and descriptions, or the history of the use of the name ecclesia itself.

On the return from the Mount of Olives the eleven remaining Apostles go up into the upper chamber where they were staying (i. 13), and thus renew, as it were, their coherence as a definite body.

A somewhat larger body is next mentioned as “attending steadfastly with one accord upon ‘the prayer’,” certain women, and the Lord's mother and brethren, being associated with the Apostles. This peculiar phrase taken in conjunction with “the prayers” (ii. 42) and “the prayer” (vi. 4) suggests that a definite custom of common prayer is intended, a bond of Christian fellowship.

Next in v. 15 we read of a larger assembly, probably the whole body of ‘brethren’ as they are emphatically called, about 120 in number. “In the midst of the brethren,” St Luke says, St Peter rose up and declared the need of filling up the place left vacant by Judas.

The next chapter relates the appearance of the fiery tongues on the day of Pentecost, St Peter's discourse, and the results of it.