Midrash for Pesachim 97:8
א"ר יוחנן לא קשיא הא ר' יהודה הא רבי יוסי דתניא סעודת אירוסין רשות דברי ר' יהודה רבי יוסי אומר מצוה
OR FROM A RIVER OR FROM BRIGANDS<span class="x" onmousemove="('comment',' Var. lec.: a robber band.');"><sup>13</sup></span> OR FROM A FIRE OR FROM A COLLAPSE [OF A BUILDING], HE ANNULS IT IN HIS HEART.<span class="x" onmousemove="('comment',' If 'robber band' is read before, this must be deleted. Even if there is time to return, he must not go back.');"><sup>14</sup></span>
Sifrei Devarim
"shall not be seen unto you": Do not see it as being yours, but void it in your heart — whence they ruled: "If one were on his way (on the fourteenth of Nissan) to slaughter his Pesach offering, or to circumcise his son, or to eat the betrothal feast in the house of his father-in-law, and he remembered that he had chametz in his house — if he can return (home) and burn it and return to his mitzvah, he should do so; if not, he should void it in his heart.
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