大般涅槃経
Another example is that of Buddhist warrior monks in feudal Japan who sometimes committed organized acts of war, protecting their territories and attacking rival Buddhist sects. During the late Heian Period, the Tendai school was a particularly powerful sect, whose influential monasteries could wield armies of monks. A key text of this sect was the Mahāyāna Mahāparinirvāṇa Sūtra, which contains passages allowing the use of violence for the defense of the Dharma. The Ashikaga period saw military conflict between the Tendai school, Jōdo Shinshū school and the Nichiren Buddhists. Zen Buddhism was influential among the samurai, and their Bushido code.