"Now when the people saw that they were coming against them they went out to meet them, and prostrated themselves before them to the earth, and began to call on the name of the Lord; and thus they were in this attitude when the Lamanites began to fall upon them, and began to slay them with the sword. And thus...they did slay a thousand and five of them; and we know that they are blessed, for they have gone to dwell with their God. Now when the Lamanites saw that their brethren would not flee from the sword...Now when the Lamanites saw this they did forbear from slaying them; and there were many whose hearts had swollen in them for those of their brethren who had fallen under the sword, for they repented of the things which they had done." (Alma 24:21-24)
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He wants us to doubt and be discouraging about the choices we make to be Christ like. BUT, he can only prevail if we let him. If these people would have made any other choose other then the one they did, they would have ether denied there faith or broken a covenant with God. But because they chose to stand for what they knew was right "those who had been slain were righteous people, therefore we have no reason to doubt but what they were saved." (Alma 24:26) As we endure the trials we face we will have no reason to doubt that we can be saved when our time comes because we were faithful in obeying the commandments of God.