1 And now, behold, I say unto you, that ye ought to search these things. Yea, a commandment I give unto you that ye search these things diligently; for great are the words of Isaiah.
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Behold, the city of Laman, and the city of Josh, and the city of Gad, and the city of Kishkumen, have I [Jesus] caused to be burned with fire, and the inhabitants thereof. 3 Nephi 9:10 9:10
Trivia: What was the new commandment that Jesus gave the Nephites in 3 Nephi 23?
1 And now, behold, I say unto you, that ye ought to search these things. Yea, a commandment I give unto you that ye search these things diligently; for great are the words of Isaiah.
Then Jesus said to the Nephites:
Study the book of Isaiah. [1]
2 For surely he spake as touching all things concerning my people which are of the house of Israel; therefore it must needs be that he must speak also to the Gentiles.
Isaiah spoke about the people of Israel, so he must also have spoken to the Gentiles.
3 And all things that he spake have been and shall be, even according to the words which he spake.
Everything he said would happen, happened.
4 Therefore give heed to my words; write the things which I have told you; and according to the time and the will of the Father they shall go forth unto the Gentiles.
Write the things that I tell you to write.
5 And whosoever will hearken unto my words and repenteth and is baptized, the same shall be saved. Search the prophets, for many there be that testify of these things.
Whoever obeys me, repents, and is baptized will be saved.
6 And now it came to pass that when Jesus had said these words he said unto them again, after he had expounded all the scriptures unto them which they had received, he said unto them: Behold, other scriptures I would that ye should write, that ye have not.
There are other scriptures that you should write.
7 It came to pass that he said unto Nephi: Bring forth the record which ye have kept.
8 And when Nephi had brought forth the records, and laid them before him, he cast his eyes upon them and said:
Then Jesus said to Nephi,
Bring the plates that you've been engraving lately.
So Nephi showed them to him.
9 Verily I say unto you, I commanded my servant Samuel, the Lamanite, that he should testify unto this people, that at the day that the Father should glorify his name in me that there were many saints who should arise from the dead, and should appear unto many, and should minister unto them. And he said unto them: Was it not so?
Jesus said,
You know about Samuel the Lamanite, don't you? [2]
10 And his disciples answered him and said: Yea, Lord, Samuel did prophesy according to thy words, and they were all fulfilled.
His disciples answered,
Yes, Lord, we know about him.
11 And Jesus said unto them: How be it that ye have not written this thing, that many saints did arise and appear unto many and did minister unto them?
Jesus said,
Why isn't there anything about him on these plates?
12 It came to pass that Nephi remembered that this thing had not been written.
13 It came to pass that Jesus commanded that it should be written; therefore it was written according as he commanded.
Nephi said,
Yeah, I forgot to say anything about Samuel.
Jesus told Nephi to get busy and do that.
14 And now it came to pass that when Jesus had expounded all the scriptures in one, which they had written, he commanded them that they should teach the things which he had expounded unto them.
And Nephi did as he was told.
Notes
Although Jesus doesn't say so, I'm sure he'd prefer that his followers read Isaiah in preferably the King James Version of the Bible. That is, after all, what he quoted from. (It might be hard to find at the time of his commeandment, though, (34 CE), since the KJV wasn't published until 1611.)
For stories about Samuel the Lamanite see Helaman 13-16