Final answer:
The phrase "The walls of Jericho will protect you from the Big Bad Wolf" is from 'It Happened One Night.' Clark Gable's character reassures Claudette Colbert's character with this line in the 1934 romantic comedy directed by Frank Capra.
Step-by-step explanation:
The line "The walls of Jericho will protect you from the Big Bad Wolf" is from the film It Happened One Night. In this movie, Clark Gable's character uses this phrase to reassure Claudette Colbert's character as he sets up a metaphorical barrier between them using a blanket while sharing a motel room, promising her safety and privacy. This 1934 romantic comedy was directed by Frank Capra and is notable for being the first film to win all five major Academy Awards (Best Picture, Best Director, Best Actor, Best Actress, and Best Adapted Screenplay).