Assuming the hash of the commit you want is
git checkout c5f567 -- file1/to/restore file2/to/restore
The git checkout man page gives more information.
If you want to revert to the commit before
~1 (where 1 is the number of commits you want to go back, it can be anything):
git checkout c5f567~1 -- file1/to/restore file2/to/restore
As a side note, I've always been uncomfortable with this command because it's used for both ordinary things (changing between branches) and unusual, destructive things (discarding changes in the working directory).
There is also a new
git restore command that is specifically designed for restoring working copy files that have been modified. If your git is new enough you can use this command, but the documentation comes with a warning:
THIS COMMAND IS EXPERIMENTAL. THE BEHAVIOR MAY CHANGE.