Tosefta for Pesachim 71:13
ושוין שאין לשין את העיסה בפושרין: מאי שנא ממנחות דתנן כל המנחות נילושות בפושרין (ומשתמרין) שלא יחמצו אם אמרו בזריזין יאמרו בשאין זריזין
But the Sages maintain: With that with which one may knead, one may smooth, while with that with which one may not knead, one may not smooth. And they ail agree that dough may not be kneaded with lukewarm [water]!<span class="x" onmousemove="('comment',' This causes fermentation very quickly.');"><sup>12</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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