Moroni presents the evidence of faith on behalf of prophets of the New World who have lived before him. This is a catalogue of events that have been discussed in his father’s text. There may have been other occasions, but we have the shaking of the earth and the falling down of the prison walls in the case of Alma and Amulek (Alma 14:27), and the combination of fiery furnace and survival of wild beasts attributed more than once to the three Nephites (3 Nephi 21:22; 4 Nephi 1:32-33).
The most interesting of Moroni’s depictions of the faith of the fathers is the moving of the mountain. The only time we see this in our Book of Mormon record is in Ether 12:30 in a passing comment by Moroni that is out of chronological order. This tells us that by the time Moroni writes this sentence, he has read the book of Ether. It does not necessarily mean that Moroni was writing in Ether at this time, but he was certainly reading in preparation for writing it.
The impact of Moroni’s citation of the faith of the fathers is to not that they were able to make things happen through faith. Therefore, if they have faith and pray on behalf of their brethren, then what they prayed for will surely come to pass. This theme is picked up again in verse 26.