Nephi and Lehi were surrounded by fire which did not harm them (see v. 23). Compare this with the experience of Shadrach, Meshach, and Abed-nego in the fiery furnace (see Daniel 3:19–27), and the experience recorded concerning the little children at the time of Jesus’ visit to the Nephites (see 3 Nephi 17:24).
The walls of the prison shook on three separate occasions as if they might tumble down (see Helaman 5:27, 31, 33). Compare this to the time the walls of the prison in Ammonihah fell and killed all but Alma and Amulek (see Alma 14:27–28).
A voice was heard from heaven three separate times commanding the people to repent and to cease persecuting the servants of the Lord (see Helaman 5:29, 32–33). This is similar to the voice that was heard just prior to the Savior’s appearance among the Nephites (see 3 Nephi 9, 10:3–7).
A cloud of darkness overshadowed those who assembled near the prison, making it impossible for the Lamanites to flee “because of the fear which did come upon them” (Helaman 5:34). Compare this with the darkness at the time of Jesus’ crucifixion (see 3 Nephi 8:20–23).