Exodus 35:3 "You shall kindle no fire in all your dwelling places on the Sabbath day."

The key word here seems to be "kindle".

Does this mean they were only restricted from starting a fire on the Sabbath, or that they could not have one at all? If not at all, what would their source of heat be in the winter on Sabbath days?

  • 1
    I approve of the title edits. Thank you everyone for helping make the question better. Mar 30, 2016 at 12:30

2 Answers 2


While the Karaites interpreted this verse to mean that no flames may be burning on the Sabbath at all, the traditional Rabbinic interpretation (see Mechilta 35:3) is that fire may burn on the Sabbath so long as it was lit beforehand. No fuel may be ignited on the Sabbath (including, for example, pouring more oil into a burning lamp). (See at length Ibn Ezra's Short Commentary ad loc., where he records a debate he had with a Karaite on the matter.)

Thus, Jews following that interpretation have traditions that enhance comfort on the Sabbath like lighting candles before the Sabbath to be able to see at night, and leaving ovens on from before Sabbath to be able to eat hot food. In the early middle ages this dispute became quite a shibboleth, with Jews who didn't eat hot food on the Sabbath being accused of heresy. Some more about the Rabbinical responses to that can be found in Hebrew here.

  • While it may implicitly do so, I don't think this answer the question's title about "[keeping] an existing fire going on the Sabbath". To keep a fire going, one would need to add fuel to it and I don't think this answer addresses that.
    – Lee
    Mar 30, 2016 at 8:03
  • @Lee see my edit to the title. You're right about the title as it currently stands but I think the content of the question clarifies that the op meant to ask what this answer is answering.
    – andrewmh20
    Mar 30, 2016 at 10:30
  • You're both right. I read the verse and wondered if a possible workaround was to start a fire before Sabbath and let it burn throughout the Sabbath. I am also curious about whether fuel could be added to the existing fire, but those are probably two separate although heavily connected questions. Mar 30, 2016 at 12:29
  • @DanielNalbach I clarified that fuel can't be added. As Shalom notes below there are cases where asking a non-Jew to start a fire could be acceptable (danger to health) and that was commonly utilized in cold climate countries (such as northern europe), but under what circumstances a Jew can ask a non-Jew to do work on the Sabbath is really a separate issue.
    – Double AA
    Mar 30, 2016 at 15:14

The Spoken Law recorded in the Talmud gives many more details of prohibited labor on the Sabbath than what you'd see in a strict literal reading of the verse. Moses commands the people to keep the Sabbath, and then to build the Tabernacle. The Talmud concludes that any act of physical creation used to build the Tabernacle is prohibited "work" on the Sabbath. For instance you'll never find a verse that weaving is prohibited on Sabbath, but traditional Judaism follows the Talmud that as it was an act of labor building the Tabernacle, it's prohibited.

(The commentaries address why Exodus chose to single out kindling over any other labor; one suggestion is that kindling tends to be an enabler rather than the final product for many labors -- I am kindling so I can dye this wool or cast this gold -- and yet it is still prohibited.)

The Talmud's interpretation of the prohibition of kindling includes both starting and fueling a flame. Therefore adding fuel to an existing fire would be prohibited.

As for how people managed: ideally, leave enough wood around from before the Sabbath to last the whole day. Otherwise, often a non-Jew was asked (or employed) to add fuel. While generally we try to avoid asking a non-Jew to do labor on the Sabbath that we can't do, there is a dispensation for those who are unwell, and we don't want people to get frostbite.

  • When you say "leave enough wood around" do you mean having a wood pile next to the fire to add pieces from, or do you mean building the fire with some type of structure that causes more wood to gradually burn over time without intervention? Mar 30, 2016 at 12:34
  • @DanielNalbach the latter. Can't toss on a log on Sabbath.
    – Shalom
    Mar 30, 2016 at 13:25

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