How do I pull a specific commit?

The short answer is: you cannot pull a specific commit from a remote.

However, you may fetch new data from the remote and then use git-checkout COMMIT_ID to view the code at the COMMIT_ID.

If you want to bring that specific COMMIT_ID to your local branch, you may either use git-cherry-pick to bring only that commit over, or git-merge to bring all changes up to that commit to your local branch.

# make sure you fetch from the origin first
$ git fetch origin

# view code at COMMIT_ID (abc123)
$ git checkout abc123

# bring only COMMIT_ID (abc123)
# to your branch
# assuming your branch is master
$ git checkout master
$ git cherry-pick abc123

# bring all changes up to 
# COMMIT_ID (abc123) to your branch
# assuming your branch is master
$ git checkout master
$ git merge abc123

You can find more information in the Official Documentation.

Here are the links for: git-merge, git-cherry-pick and git-checkout.