In the bible, what do they call the person that is going to save someone from temptation?

I'm making an ogy to the person who saves people from temptation in the this poem I'm yzing. In the poem, the horse saves the traveler form temptation, and I want to say "the horse can also be viewed as _________. (and in that blank, I want to put the word that is used to describe a person that is going to save someone from temptation) I'm not a religious person, but I think this will be a good metaphor in my essay, but I'm not Catholic, or Christian, nor do I follow on a particular religion, so I'm having touble remembering what that person would be called. The poem (if you are interesting in knowing) Is "Stopping by the Woods on a Snowy Evening," by Robert Frost. 10 points best answer, I PROMISE! =]