When they assemble at Saïs on the night of the sacrifice, they keep lamps burning outside around their houses. These lamps are saucers full of salt and oil on which the wick floats, and they burn all night. This is called the Feast of Lamps. Egyptians who do not come to this are mindful on the night of sacrifice to keep their own lamps burning, and so they are alight not only at Saïs but throughout Egypt . A sacred tale is told showing why this night is lit up thus and honored.