א עַכְבָּר שֶׁנִּכְנַס לְבַיִת בָּדוּק וְכִכָּר בְּפִיו, וְנִכְנַס אַחֲרָיו וּמָצָא פֵּרוּרִין אֲפִלּוּ כְּדֵי כָּל הַכִּכָּר, צָרִיךְ לַחֲזֹר לִבְדֹּק הַבַּיִת אַחַר הַכִּכָּר שֶׁהִכְנִיס; לְפִי שֶׁאֵין דַּרְכּוֹ שֶׁל עַכְבָּר לְפָרֵר, וְהָנֵי פֵּרוּרִין מֵעָלְמָא אָתוּ וְלֹא מֵאוֹתוֹ כִּכָּר. אֲבָל אִם תִּינוֹק נִכְנַס לְבַיִת בָּדוּק וְכִכָּר בְּיָדוֹ וְנִכְנַס אַחֲרָיו וּמָצָא פֵּרוּרִין, אֵינוֹ צָרִיךְ לַחֲזֹר וְלִבְדֹּק שֶׁחֶזְקָתוֹ שֶׁאֲכָלוֹ, וְאֵלּוּ הַפֵּרוּרִין שֶׁנָּפְלוּ מִמֶּנּוּ בִּשְׁעַת אֲכִילָה, שֶׁדֶּרֶךְ הַתִּינוֹק לְפָרֵר. וְיֵשׁ אוֹמְרִים שֶׁאִם אֵין בַּפֵּרוּרִין כְּדֵי כָּל הַכִּכָּר, צָרִיךְ לַחֲזֹר וְלִבְדֹּק. דִּינֵי עַכְבָּר נִכְנַס וְיוֹצֵא הִשְׁמִיט הָרַב, הוֹאִיל וְלֹא שְׁכִיחֵי.
1 [The Laws that Apply when] a Mouse Enters a Place that was Previously Searched with a Loaf in Its Mouth, 2 Seifim If a mouse enters a house that has been checked, carrying a loaf in its mouth, and one enters after it, and one finds crumbs, even if enough crumbs to constitute the entire loaf, one must return and inspect the house after the loaf that the mouse brought in, as it is not the nature of a mouse to break up bread, and these crumbs likely came from elsewhere and not from that loaf. However, if a toddler enters a house carrying a loaf in its hand, and one enters after it, and crumbs are found, there is no need to return and inspect, assuming that the toddler ate, and these crumbs fell from it during eating, as it is the toddler's nature to break up bread. Some say that if the crumbs do not amount to the entire loaf, one must still return and inspect. The laws concerning a mouse entering and leaving were omitted by the Rabbi since they are uncommon