Tosefta for Pesachim 71:18
תנו רבנן יכול יוצא אדם ידי חובתו בבכורים תלמוד לומר (שמות יב, כ) בכל מושבותיכם תאכלו מצות מצה הנאכלת בכל מושבותיכם יצאו בכורים שאין נאכלין בכל מושבותיכם אלא בירושלים דברי רבי יוסי הגלילי
And they all agree that dough may not be kneaded with lukewarm [water]'. Why is it different from meal-offerings: for we learned: All meal-offerings<span class="x" onmousemove="('comment',' Which were offered unleavened.');"><sup>18</sup></span>
Tosefta Pesachim
One may not knead matzah using boiling water because it parboils (i.e., causes the outer shell of the wheat kernel to leaven, see Y. Pes. II.7.4, Guggenheimer), nor using lukewarm water because it causes it to ferment, but one may knead it using cold water. One may not knead matzah using any other type of liquid, and if [one does begin to so] knead it, he may bake it immediately [without rendering it chametz], but Rabbi Meir forbids it. But one may spread any of these [liquids] on it (i.e., on the surface of the matzah dough, see Pes. 36a:9).
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