You can translate this in an active form. AT: "in order to fulfill the message of Isaiah the prophet" (See: [[rc://en/ta/man/translate/figs-activepassive]])
# Lord, who has believed our report, and to whom has the arm of the Lord been revealed?
This appears in the form of two rhetorical questions to express the prophet's dismay that the people do not believe his message.They may be stated as a single rhetorical question, AT: "Lord, hardly anyone has believed our message, even though they have seen that you are powerfully able to save them!" (See: [[rc://en/ta/man/translate/figs-rquestion]])