Jesus now begins a transition into the next task of his stay with the Nephites in Bountiful. The previous message dealt with the events of the end of times, and now the next message will deal with record keeping. Jesus is aware that the Nephites are a record-keeping people. He is aware that they have the record of Isaiah with them. As a transition, he keys on the fact that he has just cited a major section of Isaiah to shift the emphasis away from the message of that chapter of Isaiah to the fact that they have a chapters from Isaiah available. The command is repeated that they “ought to search these things.” This command was given earlier in the day with specific connection to Isaiah as well:
3 Nephi 20:11
11 Ye remember that I spoke unto you, and said that when the words of Isaiah should be fulfilled—behold they are written, ye have them before you, therefore search them—
In addition to the citations of Isaiah in his discourse, the Savior explicitly brackets his discourse with the command to search the written words of Isaiah in their possession.