If you want to commit on top of the current HEAD with the exact state at a different commit, undoing all the intermediate commits, then you can use reset to create the correct state of the index to make the commit.

git

# reset the index to the desired tree
git reset --hard 56e05fced (the sha you `want to go to there` to)

# move the branch pointer back to the previous HEAD
git reset --soft HEAD@{1}

git commit -m "Revert to 56e05fced"

as seen on http://stackoverflow.com/questions/1895059/revert-to-a-commit-by-sha-hash - anwser provided by Charles Bailey