Do you eat rice on Passover? Growing up, I was not allowed, but the rabbis on the daf seem to make it clear that rice does not count as Chametz (items with leaven)! While discussing which grains require separating challah (not the loaf, challah actually refers to a percentage of dough/bread taken from your dough/bread to be offered to the Levites) we learn that the 5 species that require challah are the same 5 species forbidden to eat not in matzah form on Passover.
A Sage taught in a baraita: Spelt is a type of wheat, while oats and rye are a type of barley. The Gemara translates the lesser-known species into the vernacular Aramaic: Spelt is called gulva, rye is dishra, and oats are shibbolei ta’ala. The Gemara infers: With regard to these species, yes, the obligation of ḥalla applies to them, but concerning rice and millet, no, the obligation of ḥalla does not apply to them. The Gemara asks: From where is this matter, that only these five grains are obligated in the separations of ḥalla, derived? Reish Lakish said: This principle is derived by means of a verbal analogy between “bread” and “bread” from the case of matza. It is written here, with regard to ḥalla: “And it shall be that when you eat of the bread of the land, you shall set apart a portion for a gift to the Lord” (Numbers 15:19), and it is written there, with regard to matza: “Bread of affliction” (Deuteronomy 16:3). Just as matza can be prepared only from one of those five grains, so too the obligation of ḥalla applies only to bread from one of those five grains. The Gemara asks: And there, with regard to matza itself, from where do we derive that it must be from one of those five grains? The Gemara answers: Reish Lakish said, and likewise a Sage of the school of Rabbi Yishmael taught, and likewise a Sage of the school of Rabbi Eliezer ben Ya’akov taught, that the verse states: “You shall eat no leavened bread with it; seven days you shall eat with it matza, the bread of affliction” (Deuteronomy 16:3). This verse indicates that only with regard to substances that will come to a state of leavening does a person fulfill his obligation to eat matzaby eating them on Passover, provided that he prevents them from becoming leavened. This serves to exclude these foods, i.e., rice, millet, and similar grains, which, even if flour is prepared from them and water is added to their flour, do not come to a state of leavening but to a state of decay [sirḥon].
It’s all chemistry my dear. When mixed with water, the five species of grain from which matzah may be made undergo fermentation even without the addition of yeast, while rice will spoil long before the fermentation process becomes noticeable.
Go science! Go rabbis! And maybe, go buy some rice for Passover!
I’m sure you’re wondering how – if the Talmud allows it – so many of us grew up not eating rice on Passover. This restriction was established in the 13th century when the Ashkenazi rabbis insister rice can be confused with or contaminated by on eof the 5 forbidden grains. Now you know. Now you can make the call.