梵網經菩薩戒本疏 3.36

3.36

Ninth, regarding exceptions and restrictions: First, exceptions: that is to say, when rescuing sentient beings from dangers to life, etc., it should be permitted as medicine, like killing, stealing, etc., and also like what Lady Mallikā did, etc. Second, restrictions: even down to a single drop on a hair, etc., or giving rise to a single thought, etc., there is the meaning of committing an offense; hence all are barred.