"The Hammer of God" is a short story by G. K. Chesterton. It features his detective, Father Brown, and was published in the short story collection The Innocence of Father Brown (1911).
It is a story about two brothers: "Colonel Bohun, a drunkard and playboy, and Reverend Bohun, curate of an Anglican church." Jennifer Halloran notes that it echoes the story of Cain and Abel.
The story was adapted into the opening episodes for the 1974 and 2013 series.