Christ commands us to search the words of Isaiah. His words and the words of Isaiah will go to the Gentiles, who will also be his covenant people if they will hearken to his words.
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.
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.
3 And all things that he spake have been and shall be, even according to the words which he spake.
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.
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.