Talmud for Pesachim 57:14
רב אחא בר רבא תנא לה
He who says [that] he commits trespass holds, One may redeem sacred food in order to feed dogs therewith; while he who rules [that] he does not commit trespass holds, One may not redeem [etc.].<span class="x" onmousemove="('comment',' If these Tannaim held with R. Simeon that during Passover it is forbidden for general use, they would agree that he is not liable for trespass, since it was valueless when he actually ate it, notwithstanding that it would become valuable after Passover. But they hold with R. Jose the Galilean that leaven is permitted for use during Passover. Now, the only use to which leaven can be put then is to give it to dogs. This may be done with ordinary leaven, but there is a controversy in respect of sacred leaven. The first Tanna holds that it can be redeemed for that purpose: hence the leaven is valuable, and therefore the eater commits trespass. But the others ('some say') hold that sacred leaven may not be redeemed for dogs. Consequently it has no value, and the eater does not commit trespass.');"><sup>15</sup></span> R'Aha B'Raba recited