A great deal if not most gasoline in America may contain ethanol. Ethanol may be sourced from corn, wheat, and other potentially problematic sources. What's more, its combustion in the engine might potentially be characterized as a form of cooking.

Please provide sources which answer the question of whether we can derive benefit from the gas in our cars (i.e. by driving) during Chol HaMoed Pesach.

  • 3
    Do you consider it edible? Apr 21, 2016 at 9:31

1 Answer 1


No because it is unfit for canine consumption

pesachim 15b

Shall we say that this supports him: If a loaf goes mouldy and is unfit for human consumption, yet a dog can eat it, it can be defiled with the uncleanness of eatables, if the size of an egg


With whom agrees the following which we learned: A general principle was stated in respect to the laws of [ritual] cleanness: Whatever is set aside for human consumption is unclean, until it becomes unfit for a dog to eat? (‏ כְּלָל אָמְרוּ בַטָּהֳרוֹת, כֹּל הַמְיֻחָד לְאֹכֶל אָדָם, טָמֵא, עַד שֶׁיִּפָּסֵל מֵאֹכֶל הַכֶּלֶב ‏) With whom [does this agree]? It is not in accordance with R`Nathan {i.e. more stringent than Rabbi Nathan, so everybody agrees that Chamets unfit for a dog to eat is not Chamets}.

Rambam, Zemanim, Chamets Umatsa, 4, 11

Halacha 11 ‏ הפת עצמה שעפשה ונפסלה מלאכול הכלב ומלוגמא שנסרחה אינו צריך לבער. בגד

השגות הראבד הפת עצמה וכו' . כתב הראב"ד ז"ל בירושלמי מפרש בשנסרחה ולבסוף נתחמצה עכ"ל: בגדים שכבסו וכו'. כתב הראב"ד ז"ל אין זה טעם אלא שכבר נפסל מן אכילת הכלב ועל כל זה שהוא כמו שייחדוהו לישיבה וטח פניו בטיט עכ"ל: ‏ Bread itself which became moldy and is no longer fit for consumption by a dog, or a compress that has become spoiled, need not be destroyed. {The Raavad reported, on behalf of Talmud Yerushalmi (Pesachim chapter 2, halacha 6), that if the chimuts happened during the week of Pessach and the deterioration happened after the chimuts (2 conditions) (may be too if the deterioration only happned during the week), the ban remains and we need to burn the chamets. But S.A. follows the Rambam and do not mention this rule, so he does not agree} (I am grateful to @newcommer who taught me the relevance of the advice of the Raavad) ‏

Raavad chapter 1, halacha 2

כתב הראב"ד ז"ל דוקא לשיעוריהן אבל לענין ביעור ולענין אכילה יש הפרש ביניהם שהחמץ אם נפסל מאכילת הכלב אין זקוק לבער והשאור אף על פי שהוא נפסל חייב לבער לפי שהוא ראוי לשחקו ולחמץ בו כמה עיסות אלא א"כ יחדו לישיבה וטח פניו בטיט. ומה ששנו בתוספתא הפת שעיפשה חייב לבער מפני שהוא ראוי לשחקה וכו' בפת של שאור קאמר דאי בחמץ לא היה צריך לזה הטעם עכ"ל: ‏
The Raavad rules that if the Chamets is still usable as leaven, despite his deterioration, it remains banned as "Seor" and might to be burned. But S.A. follows the Rambam and do not mention this rule, so he does not agree {despite that in Gemara Beitsa 7b, Rabbi Zeira rules that Seor is prohibited even when unfit to eat, maybe that he means human consumption}).

See S.A. O.C. 442, 2 and 442, 9

Important. If the Chamets is edible in Pessach and transformed in the middle of Pessach to gas, there is an absolute benefit prohibiton as there is for Chamets ashes, following the Gemara Temura 34a:

the ashes of things which are buried are forbidden [to be used],"

And we rule as Chachamim that Chamets Bepessach is not to be burnt (contrarily to Rabbi Yehuda), so its ash is forbidden. (See Maggid Mishne Chamets Umatsa 3, 11 "ועוד שאין חמץ בפסח מן הנשרפין שאפרן מותר")

  • 1
    I am not in the inyan but I do seem to remember some machlokes rambam and raavad about it.
    – newcomer
    Apr 21, 2016 at 6:02
  • @newcomer hilchot CHamets umatsa perek 2 halacha 10. I need to learn. Thank you!
    – kouty
    Apr 21, 2016 at 7:22
  • 1
    Can you substantiate your claim that it's unfit for canine consumption?
    – msh210
    Apr 21, 2016 at 8:58
  • 2
    @msh210 gas for canine consumption?
    – kouty
    Apr 21, 2016 at 9:26
  • If it is edible to humans will it if not edible to dogs change something?
    – hazoriz
    Apr 21, 2016 at 12:41

Not the answer you're looking for? Browse other questions tagged .