Reference for Pesachim 12:17
וניבטליה בארבע וניבטליה בחמש כיון דלאו זמן איסורא הוא ולאו זמן ביעורא הוא דילמא פשע ולא מבטל ליה
- Said Raba: It is a preventive measure, lest he find a tasty loaf<span class="x" onmousemove="('comment',' , a loaf made from a special brand of white flour.');"><sup>21</sup></span> and [set] his mind upon it.<span class="x" onmousemove="('comment',' To keep it until after Passover.');"><sup>22</sup></span> Then let him annul it when he finds it? - He may find it after the interdict [commences], and then it does not stand in his ownership and [so] he cannot annul it. For R'Eleazar said: Two things are not in a man's ownership, yet the Writ regarded them as though they were in his ownership. And these are they: a pit in public ground<span class="x" onmousemove="('comment',' He who digs a pit in public ground is responsible for any damage it may cause, as though it were his property, though actually it is not.');"><sup>23</sup></span> and leaven from six hours<span class="x" onmousemove="('comment',' I.e., noon.');"><sup>24</sup></span> and onwards.<span class="x" onmousemove="('comment',' One is culpable for its presence in his house then, though technically speaking it is no longer his.');"><sup>25</sup></span> Then let him annul it at the fourth or the fifth [hour]?<span class="x" onmousemove="('comment',' I.e., any time in the morning before noon, when it is still his. Why particularly the preceding evening, when he is making the search?');"><sup>26</sup></span> - Since it is neither the time of the prohibition nor the time of searching, he may transgress and not annul it.