The final verses are the linking text that will move both Alma and the events from Zarahemla to the city of Gideon. This information might have been at the beginning of the next chapter, as Mormon often has his linking narrative at the beginning of a chapter with the quoted material ending it. In this case, Mormon picks up on phrases from Alma’s sermon in Zarahemla.
In Alma 5:46 Alma had said: “Behold, I say unto you they are made known unto me by the Holy Spirit of God. Behold, I have fasted and prayed many days that I might know these things of myself. And now I do know of myself that they are true; for the Lord God hath made them manifest unto me by his Holy Spirit; and this is the spirit of revelation which is in me.” Mormon picked up on the concept of fasting and prayer in verse 6, and now he reprises the source of Alma’s authority through the spirit of prophecy. After reprising those words from the previous sermon, Mormon testifies that they were indeed true. Ending his testimony with Amen triggered the close of this chapter, and ensured that even though short, it would be separate from the next, rather than be part of it.