1

The water used to bake Matzah must be mayim shelanu—water that had been drawn in the evening and left to cool overnight. What is the halachic background for this requirement?

8
  • If you'd edit in what you know already (e.g. where this is in Shulchan Aruch), it'd help others trace the history back for you.
    – msh210
    Apr 10, 2016 at 19:43
  • 2
    See פסחים נב עמוד א׳ ושם צב עמוד ב.
    – user6591
    Apr 10, 2016 at 20:39
  • In pesachim 42a, rav yehudah makes the statement that water for matzah making must be “mayim shelanu” – waters that slept (undser vaser). This indicates that the water should have been drawn from the day before, and left to rest overnight, before use, though the exact number of hours it needs to be in vessels and such is subject to some discussion.
    – rosends
    Apr 10, 2016 at 21:04
  • The goal is to allow the water in underground springs (which was thought to be heated at night by the sun as during that time the sun was not heating from above as per an explanation on pesachim 94b) to cool sufficiently so that it does not hasten the leavening (this matches with the next drasha on the daf – that a woman should not knead dough in the sun or with warm water). The gemara gives no other source for this halacha, and those who codify it, don’t seem to tie it to a posuk or other origin
    – rosends
    Apr 10, 2016 at 21:04
  • 2
    @Danno, I don't really know Yiddish, but isn't "undser" the translation of English "our" (the other "shelanu")?
    – msh210
    Apr 10, 2016 at 21:26

1 Answer 1

0

This halacha is brought down in the Shulchan Aruch 455 where the Mishna Beura explains what it is according to Rashi. Where rashi explains that in Nissan spring water is hot as the sun heats up the springs( as the loacton of the sun in that time is close to the earth's ground). There is also another opinion who understands differently to Rashi, how the sun heats the springs up. With regards to making Matzah one is not allowed to use hot water as it will be easy to make it chametzdik. Therefore the Rabbi's said one must leave this hot water in a vessel overnight to cool it down.

1
  • 1
    What if you're baking the matza months in advance of Nissan (as many modern bakeries do)?
    – Double AA
    Nov 23, 2020 at 14:28

You must log in to answer this question.

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