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At the close of chapter 8, Nephi (the son of Helaman) gives evidence of his prophet-ness by telling the people that their own iniquity has led even to the murder of their leader by his own brother. When Nephi says this, men immediately ran back to headquarters to check on their leader (verse 1). As they went, they said that if this turned out to be true, then they should also believe the other things that Nephi has said (verse 2).
When they got there, they found it to be true just as Nephi said (verse 3). This astonished them, as they had not believed what Nephi said (verse 4). But now believing, they knew that everything else was true – including the consequences of destruction for all they had done (verse 5).
When the leader had been killed, it was done in secrecy (verse 6). The people began to gather when the servants raised the cry of murder, and this is when the people found the astonished men collapsed in awe (verse 7).
These people gathered around the murdered leader did not know about what Nephi had said in his garden, and so they accused the astonished men of being the ones who had done the murdering (verse 8), so they bound them up and put them in prison (verse 9).
As word got out about what happened, and the people began to assemble to mourn for the burial of their leader (verse 10). This is when news got out about what Nephi had said at his garden (verse 11), and so people began to ask what happened to the men who were sent to confirm Nephi’s words (verse 12). That’s how the people realized those astonished men were innocent, that they only had come to check on the leader after hearing Nephi’s words (verses 13-14). The astonished men told the other leaders that they did not know who murdered the leader, other than what Nephi had told them had happened (verse 15).
The people then began to say that Nephi “must have agreed with some one to slay” him, so that he could say it would happen, “that he might convert us unto his faith” so that the people would believe he is a prophet (verse 16). So the astonished men were released, and Nephi was brought in for questioning (verses 17-18). The leaders bound Nephi, and questioned him before the people, trying to accuse him of murdering the leader (verse 19), even by trying to bribe him (verse 20).
But Nephi remained true to his calling, regardless of what they did to him or of what they accused him, and he continued to call the people to repentance (verses 21-22). He confronted their plots (verse 23), and confronted them for being angry about being called to repentance (verse 24).
Instead of being afraid of them, Nephi the prophet gets more bold as the opposition gets more coniving (verse 25). He tells them whose house to go to (verse 26), and tells them to confront that man about this plot (verse 27). He tells them the man will say no (verse 28), and that then they should ask him outright if he murdered his brother (verse 29). Nephi says that when they do this, the man will “stand with fear, and wist not what to say”, and deny the charges and try to look astonished and declare his innocence (verse 30). But, when they examine him, they will find blood on his clothes (verse 31). Nephi tells them to ask about the blood (verse 32), and then the man will “tremble, and shall look pale, even as if death had come upon him” (verse 33), and that by this they will know he is guilty (verse 34) – even so much that the man will confess to them (verse 35). Nephi tells the people that he knows this by the power of God, and that it is given to them as a sign that he is a true prophet (verse 36).
So the people went and did as Nephi said, and all of it happened as he had said it would (verse 37).
In this way, the murdered was caught, the astonished men were released, and Nephi was released (verse 38).
Some of the people then believed the words of Nephi and the testimony of those who had been astonished at his prophecy (verse 39), even testifying that Nephi was a prophet (verse 40).