Verses 21 and 22 are not part of the main story line, but instead they comment on the story and tell about something that happens later. (See: [[rc://en/ta/man/translate/writing-endofstory]])
This remark appears in the form of a question to show that the Jewish authorities understand that Jesus wants to tear down the temple and build it again in three days. "Raise" is an idiom for "establish." AT: "you will establish it in three days?" or "you cannot possibly rebuild it in three days!" (See: [[rc://en/ta/man/translate/figs-rquestion]] and [[rc://en/ta/man/translate/figs-idiom]])