בבא קמא פרק ו משנה ו

(6) If a spark went out from under the hammer and caused damage, he is liable. If a camel laden with flax passed by in the public domain and its load of flax entered into a shop and caught fire from the storeowner's candle and lit a large house on fire, the owner of the camel is liable. But if the shopkeeper left his candle outside, the shopkeeper is liable. Rabbi Judah says: If it was a Hannukah light, he is exempt.