Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[323] Now Judas celebrated the festival of the restoration of the sacrifices of the temple for eight days, and omitted no sort of pleasures thereon; but he feasted them upon very rich and splendid sacrifices; and he honored God, and delighted them by hymns and psalms. Nay, they were so very glad at the revival of their customs, when, after a long time of intermission, they unexpectedly had regained the freedom of their worship, that they made it a law for their posterity, that they should keep a festival, on account of the restoration of their temple worship, for eight days. And from that time to this we celebrate this festival, and call it Lights. I suppose the reason was, because this liberty beyond our hopes appeared to us; and that thence was the name given to that festival. Judas also rebuilt the walls round about the city, and reared towers of great height against the incursions of enemies, and set guards therein. He also fortified the city Bethsura, that it might serve as a citadel against any distresses that might come from our enemies.