Dan Ackroyd, left, and John Belushi, right, star as two...

Dan Ackroyd, left, and John Belushi, right, star as two brothers trying to reassemble their band after one of them is released from prison in "The Blues Brothers," a musical comedy. (1980) Credit: Universal Pictures

"We're on a mission from God," Elwood Blues says in the 1980 hit movie "Blues Brothers."

Now the Vatican has blessed their mission, branding the John Belushi and Dan Aykroyd comedy an official "Catholic Classic" on the flick's 30th anniversary.

"Blues Brothers," which is based on a "Saturday Night Live" skit, joins other so called classics such as "The Ten Commandments," "Joan of Arc," "It's a Wonderful Life" and "The Passion of the Christ."

The John Landis movie was deemed a classic in the official Vatican newspaper L'Osservatore Romano.

Though the movie chronicles the brothers' zany adventures to raise money for the church-run orphanage where they grew up, the movie isn't overtly religious or deferential to Catholicism.

That might be no more evident when Elwood Blues, played by Aykroyd, insults a nun after she swats him with a ruler for swearing in front of her.

"Boys," the character Curtis, played by Cab Calloway, says afterward, "you gotta learn not to talk to nuns that way."

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