Halakhah for Pesachim 189:12
בכלליה דמצות ומרורים מאי קא מרבי צלי אש בפרטיה מאי ממעיט ליה השבתת שאור איפוך אנא מצוה דגופיה עדיף
Also, I know it only of a negative precept modified to a positive precept;<span class="x" onmousemove="('comment',' A prohibition which if violated must be repaired by a positive act. Thus 'and ye shall let nothing of it remain until the morning' (Ex. XII, 10) is followed by 'but that which remaineth of it until the morning ye shall burn with fire'. Technically such an injunction is less stringent than an ordinary negative precept and does not involve flagellation.');"><sup>16</sup></span> how do we know it of an absolute negative precept?
Sefer HaChinukh
From the laws of the commandment is that which they, may their memory be blessed, taught in Pesachim 95a in the chapter [entitled] Mi Shehaya Tamei, "What [are the differences] between first and second? On the first all leaven is forbidden to be seen or kept in one's possession; on the second both leaven and matsa are with him in the house. The second is only observed one day, and there is no holiday or prohibition of labor. The first requires Hallel while eating it; the second does not require Hallel while eating it - though this and that require Hallel during the offering. Both are eaten roasted with matsa and marror," as it is explicitly stated like that in the verse. "Both supersede the Shabbat, and neither may be left over or have bones broken in them," as the verse explicitly warns about this too, with "do not leave over" and "they shall not break a bone in it."
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