According to the "Four-Part Rule", because the rooms where the monks lived at that time were all dark troubles, the Buddha allowed the lighting of candles, and gave oil when needed, candles when needed, and lamps when lamps were needed. The monks also asked the Buddha, where should the lamp be placed? The Buddha replied that it could be placed on a bottle in the corner of the bed, and if it was placed between the walls, it would prevent insects and ants from stealing food; If the lamp is dim and about to go out, you need to carry a lamp; If you are afraid of getting your hands dirty, you can also use lamp chopsticks to pick out the wick, and because the chopsticks are easy to burn, iron lamp chopsticks are allowed. In this account, the Buddha gave a detailed explanation of the permission to use lamps to illuminate the monks' quarters and the places where the lights were placed.