macro for repeating a theorem statement in appendix

[Qiqi Yan]

Hi all,

So I have a (complicated) theorem statement in the main text of a paper, 
which I want to repeat in the appendix right before the proof.

Is there a macro-way of doing this instead of copy-pasting? (\newcommand 
is probably not good as the theorem is complicated to write in latex)


Thanks a lot!

-Qiqi