The Miracle of the Oil

Why do we celebrate Chanukah?

“When the Yivanim entered the Bais HaMikdash, they defiled all the oil set aside for lighting the Menorah. When the Chashmonoim were victorious, they searched and were able to find only one small jug of oil with the Kohain Gadol’s seal intact. It had sufficient oil to last only one day, but miraculously it lasted eight days. In honor of the miracle of the oil lasting eight days, Chazal inaugurated these days for Hallel and thanksgiving.” — Gemara Shabbos 21b