One who extinguishes a lamp because he fears idolaters, because of bandits, be-cause of melancholia, or so that a sick person may fall asleep, he is exempt. [But if he does so] to spare the lamp, to spare the oil, or to spare the wick, he is liable. R’ Yose exempts in all of these [cases], except that of the wick, because he makes it [into] charcoal.