In ancient times, before the Taoism religion was founded, food would sometimes be set out as a sacrifice to the spirits of the deceased or the gods. This could include slaughtered animals, such as pigs and ducks, or fruit. The Taoist Celestial Master Zhang Taoling rejected food and animal sacrifices to the Gods. He tore apart temples which demanded animal sacrifice and drove away its priests. This rejection of sacrifices has continued into the modern day, as Taoism Temples are not allowed to use animal sacrifices (with the exception of folk temples or local tradition.) Another form of sacrifice involves the burning of joss paper, or hell money, on the assumption that images thus consumed by the fire will reappear—not as a mere image, but as the actual item—in the spirit world, making them available for revered ancestors and departed loved ones. The joss paper is mostly used when memorializing ancestors, such as done during the Qingming festival.