According to the Talmud, one flask of pure oil was found in the Temple after its liberation.
The story appears in Babylonian Talmud, tractate Shabbat 21b. After the Maccabees defeated the Seleucid forces and cleansed the Jerusalem Temple, they reportedly found only one sealed container of ritually pure olive oil. It held enough fuel for one day of the Temple menorah.
The oil is said to have miraculously burned for eight days, giving the priests time to produce and prepare a fresh supply. Hanukkah’s eight-day duration is traditionally linked to this miracle, alongside the military victory and the Temple’s rededication.
A common mix-up is confusing the number of flasks with the number of days. The Talmud describes one container whose oil lasted eight days; it does not describe eight flasks being discovered. The earlier books of Maccabees describe the revolt and rededication but do not include this later rabbinic oil narrative.