You don't. It's gone.
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Currently, you cannot recover a deleted post.
When your face book comment deleted by another parson you will see a triangle box picture (just like English letter A) next your name on the comment area. and when you take mus on this picture box you will see " comment deleted"
Once a post is deleted, it is not possible to recover it. Always be careful not to delete items you still need. However, if the post is important to an official investigation, authorities may be able to recover the post from the company records.
Unfortunately, once notification is deleted on Facebook, it is gone forever. The only exception to this is if the user has archived the information, rather than deleting it. In that case, it would still be accessible under the message tab.
how can i find deleted messages on facebook