Your sign. — The change of pronoun is intentional. The prophet’s action was to be a sign not only to Zedekiah and the people in Jerusalem, but also to those in captivity, since they rested their hope upon the safety of the holy city.
Related Commentaries of Ezekiel 12:11
Ezekiel 12:11
11 Say, I am your sign: like as I have done, so shall it be done unto them: they shall remove and go into captivity.