John Gill Commentary Ezekiel 12:11

"Say, I am your sign: like as I have done, so shall it be done unto them; they shall go into exile, into captivity." — Ezekiel 12:11 (ASV)

Say, I [am] your sign
Which represents you, and shows what will befall you: as I have done, so it shall be done to them ;
as he had carried out his stuff, and had removed it from one place to another, so they should be carried away out of their own land into a foreign country, as follows: they shall remove and go into captivity ;
the Babylonish captivity.