SITTWE, Myanmar — The Buddhist monastery on the edge of this seaside town is a picture of tranquillity, with novice monks in saffron robes finding shade under a towering tree and their teacher, U Nyarna, greeting a visitor in a sunlit prayer room.

But in these placid surroundings Mr. Nyarna’s message is discordant, and a far cry from the Buddhist precept of avoiding harm to living creatures. Unprompted, Mr. Nyarna launches into a rant against Muslims, calling them invaders, unwanted guests and “vipers in our laps.”

“According to Buddhist teachings we should not kill,” Mr. Nyarna said. “But when we feel threatened we cannot be saints.”

Violence here in Rakhine State — where clashes have left at least 167 people dead and 100,000 people homeless, most of them Muslims — has set off an exodus that some human rights groups condemn as ethnic cleansing. It is a measure of the deep intolerance that pervades the state, a strip of land along the Bay of Bengal in western Myanmar, that Buddhist religious leaders like Mr. Nyarna, who is the head of an association of young monks, are participating in the campaign to oust Muslims from the country, which only recently began a transition to democracy from authoritarian rule.