Jesus commands the twelve to write. Specifically, they are to write about this fulfillment of the prophecy of the other sheep for the benefit of those in Jerusalem. If those in Jerusalem do not discover them through righteousness, then they shall know of them from the writings left behind. The Savior’s requirement that these things be written for the benefit of future generations, and particularly for the convincing the Jews provides an interesting parallel to one of Nephi’s earliest prophetic experiences:
1 Nephi 13:38-42
38 And it came to pass that I beheld the remnant of the seed of my brethren, and also the book of the Lamb of God, which had proceeded forth from the mouth of the Jew, that it came forth from the Gentiles unto the remnant of the seed of my brethren.
39 And after it had come forth unto them I beheld other books, which came forth by the power of the Lamb, from the Gentiles unto them, unto the convincing of the Gentiles and the remnant of the seed of my brethren, and also the Jews who were scattered upon all the face of the earth, that the records of the prophets and of the twelve apostles of the Lamb are true.
40 And the angel spake unto me, saying: These last records, which thou hast seen among the Gentiles, shall establish the truth of the first, which are of the twelve apostles of the Lamb, and shall make known the plain and precious things which have been taken away from them; and shall make known to all kindreds, tongues, and people, that the Lamb of God is the Son of the Eternal Father, and the Savior of the world; and that all men must come unto him, or they cannot be saved.
41 And they must come according to the words which shall be established by the mouth of the Lamb; and the words of the Lamb shall be made known in the records of thy seed, as well as in the records of the twelve apostles of the Lamb; wherefore they both shall be established in one; for there is one God and one Shepherd over all the earth.
42 And the time cometh that he shall manifest himself unto all nations, both unto the Jews and also unto the Gentiles; and after he has manifested himself unto the Jews and also unto the Gentiles, then he shall manifest himself unto the Gentiles and also unto the Jews, and the last shall be first, and the first shall be last.
Both Nephi and the Savior are speaking of the same events, and interestingly enough, some of the same language appears, namely the “one fold, one shepherd” imagery in 1 Nephi 13:41.