The Guest by Nikolai S. Lesskov
Timofai Ossipovitch was exiled to Siberia for taking revenge on his uncle. He couldn't forgive his elder relative, and vowed he never would - until his prayer that Christ himself might come to his house and eat with him was answered one Christmas Eve...
http://www.bruderhof.com/articles/TheGuest.htmExcerpt from "Home for Christmas: Stories for Young and Old"