The mitzvah of Chanukkah is a [single] candle for [each] man and his household, and those who are scrupulous: A candle for each and every one, and the scrupulous among and the scrupulous among the scrupulous: Beit Shammai says: The first day he lights eight, from here going [forward], he goes on reducing, and Beit Hillel says: The first day he lights one, from here going [forward], he goes on adding. Ulla said They argued about it - two Amoraim from the West [i.e., Eretz Yisrael]: Rabbi Yosi ben Avin and Rabbi Yosi ben Zevida. One said: the reasoning of Beit Shammai is: to correspond to the days which are entering,and the reasoning of Beit Hillel is: to correspond to the days which are going out; [the other] one said: the reasoning of Beit Shammai is: to correspond to the bulls [offered on Sukkot] and the reasoning of Beit Hillel is that [we] raise up in holiness and [we] do not lower.
Our Sages taught: The Chanukkah candle - it is a mitzvah to place it at the door of his house, on the outside, and if he was living in an attic [i.e., with no direct access to public areas], he places it in a window adjoining the public area and in times of danger [i.e., persecution], he places it on his table and it is sufficient for him. Rava said: He needs another light [in order] to use its [i.e., the Chanukkah candles'] light and if there is a hearth-fire, he doesn't need [another light], but if he is a wealthy man, even though there is a hearth-fire, he does need another light.
What is Chanukkah, that our Sages taught: On the 25th of Kislev - the days of Chanukkah, they are eight, not to eulogize on them and not to fast on them? When the Greeks entered the Temple, they polluted all the oils in the Temple, and when the Hasmonean dynasty overcame and defeated them, they checked and they found but one cruse of oil that was set in place with the seal of the High Priest, but there was in it only [enough] to light a single day. A miracle was done with it, and they lit from it for eight days. The following year [the Sages] fixed those [days], making them holidays for praise and thanksgiving.