Musar for Pesachim 7:12
אמר להו רב נחמן בר יצחק תניתוה הכל נאמנים על ביעור חמץ אפילו נשים אפילו עבדים אפילו קטנים מאי טעמא מהימני
R'Nahman B'Isaac was asked: If one rents a house to his neighbour from the fourteenth, upon whom [rests the duty] to make the search? [Does it rest] upon the landlord, because the leaven is his; or perhaps upon the tenant, because the forbidden matter exists in his domain? Come and hear: If one rents a house to his neighbour, the tenant must affix a mezuzah!<span class="x" onmousemove="('comment',' v. Glos. Presumably the same principle applies here!');"><sup>17</sup></span> - There, surely R'Mesharsheya said: The mezuzah is the inhabitant's obligation; but how is it here? - Said R'Nahman B'Isaac to them, We learned it: If one rents a house to his neighbour, if the fourteenth occurs before he delivers him the keys, the landlord must make the search; while if the fourteenth occurs after he delivers the keys, the tenant must make search. R'Nahman B'Isaac was asked: If one rents a house to his neighbour on the fourteenth, does it stand in the presumption of having been searched or not? What difference does it make? Let us ask him! - He is not present to be asked: hence what about troubling this one [the tenant]?<span class="x" onmousemove="('comment',' Must we put him to the trouble of making a search?');"><sup>18</sup></span> - Said R'Nahman B'Isaac to them, We have a teaching:<span class="x" onmousemove="('comment',' Lit., 'we have learned it'.');"><sup>19</sup></span> All are believed concerning the removal of leaven, even women, even slaves, even minors.<span class="x" onmousemove="('comment',' Their testimony that the owner duly made a search is accepted.');"><sup>20</sup></span> Now why are they believed?