The first day is for the welcoming of the deities of the heavens and earth, officially beginning at midnight. It is a traditional practice to light fireworks, burn bamboo sticks and firecrackers and to make as much of a din as possible to chase off the evil spirits as encapsulated by nian of which the term guo nian was derived. Many Buddhists abstain from meat consumption on the first day because it is believed to ensure longevity for them. Some consider lighting fires and using knives to be bad luck on New Year's Day, so all food to be consumed is cooked the days before. On this day, it is considered bad luck to use the broom, as good fortune is not to be "swept away" symbolically.