Shulchan Aruch in Hilchos Chanukah (OC 677:4) cites a din from the Sheiltos that after Chanukah is over, the leftover oil from your menorah that did not completely burn needs to be gathered together and burned in one big fire. The reason, the Mechaber states, is because that leftover oil is "huktzah l'mitzvaso.” Or, since it was set aside for mitzvah use, it then becomes assur b'hanah (forbidden to benefit from), so the only thing to do with it is to burn it off. Maran then concludes with: "if that leftover Chanukah oil became mixed with regular (non-Chanukah) oil, and there isn't 60 times (shishim) the amount of regular oil to mevatel the leftover Chanukah oil, there are those who say that you cannot add the needed amount of regular oil to mevatel the Chanukah oil."...
Welcome to Daf Aleph, an educational resource on the fundamental topics in Judaism and Jewish philosophy. Covering both timeless subjects, conversations, and debates, as well as more modern and contemporary issues, Daf Aleph was created for anyone interested in learning more about a particular topic in Jewish thought. Founded after the recognition that no such easily-accessible online resource on matters of Jewish thought and machshavah exists, Daf Aleph aims to be just that — a website of Jewish thought for thoughtful Jews.
You can read more about the various Daf Aleph writers on the writers page, and subscribe via RSS or email, Twitter, or Facebook to the right.
If you have a question you’d like answered, or a topic you’d like to see covered, feel free to contact us for any reason, either via email or on Twitter. If you’re interested in writing for, or in some other way contributing to, Daf Aleph please do reach out as well.
Over the coming months we plan on building out our library, adding new topics, series, and essays as we go. We hope you'll join us.