Commentary Par XXIII 136-139

Now the poet sets all his attention on St. Peter, who will examine the protagonist on faith, the first of the three theological virtues, in Canto XXIV, serving as guide in the first and the last of the following four cantos.  In this heaven, he will share speaking parts with two other of the original disciples, James and John, as well as with the first father, Adam.  Peter will speak in both Paradiso XXIV (eight times for a total of 54 verses) and XXVII (an utterance in 36 verses and in two parts, both devoted to a ringing denunciation of the corrupt papacy).