Andy: "Sinners lose their guilty stain."
At the beginning of the episode, when Andy and Barney are humming the hymn, Andy says it is "Sinners Lose Their Guilty Stain". The hymn he refers to is actually called "There Is A Fountain", the most famous of the hymns by William Cowper (1731-1800) and usually set to "Cleansing Fountain", a 19th Century American camp meeting tune. The first stanza of the hymn is... There is a fountain filled with blood // Drawn from Immanuel's veins; // And sinners, plunged beneath that flood, // Lose all their guilty stains. // Lose all their guilty stains, // Lose all their guilty stains; // And sinners, plunged beneath that flood, // Lose all their guilty stains.