1,121. Kneading Dough on Passover

Chometz u’Matzah 5:11

On Passover, we do not knead large doughs out of concern that they may leaven. Rather, we limit dough to the size for which one would separate challah. We do not knead dough using hot water, water that was heated in the sun, or water that was drawn that same day; one may only knead dough using water that has rested for a day. If someone violates this rule and kneads dough using one of the proscribed types of water, the resulting loaf is prohibited.

Chometz u’Matzah 5:12

A woman may not sit in the sun and knead dough, nor may she do so under a cloudy sky where the sun isn’t shining. She may not leave the dough to attend to some other matter. If she is both kneading and baking, she must have two vessels of water: one for smoothing the matzah and the other for cooling her hands. If she violated these rules by kneading in the sun or by not cooling her hands, or if she made a dough larger than necessary to separate challah, the resulting loaf is permitted. The volume of dough for which one separates challah is 43.2 average-sized eggs. [In practical terms, this is a dough made from somewhere between 2.6 and four pounds of flour, though many only recite the bracha when separating challah from dough made of five pounds of flour.]