(CNN)Comedians Chris Rock and Chris Farley were great friends in their seven years together on "Saturday Night Live" in the 90s. In a new interview with Esquire, Rock says that before Farley died of an overdose in December 1997, he knew his friend didn't have long to live.Rock told the story behind an old photo of himself, Adam Sandler, Farley, and David Spade at Rock's "Bring the Pain" comedy tour.