Reference for Bava Kamma 109:16
<br><br><big><strong>הדרן עלך שור שנגח את הפרה</strong></big><br><br>
[in the section dealing with fishes] by comparison with 'after its kind'<span class="x" onmousemove="('comment',' Ibid. 25. ');"><sup>28</sup></span> [in reference to creatures] of the dry land. Rehabah inquired: If a man drove [a waggon] by means of a goat and a mullet together, what would be the legal position? Should we say that since a goat could not go down into the sea and a mullet could not go up on to the dry land, no transgression has been committed, or do we say that after all they are now pulling together?<span class="x" onmousemove="('comment',' And a sin has been committed. ');"><sup>29</sup></span> Rabina demurred to this: If this is so, supposing one took wheat and barley together in his hand and sowed the wheat on the soil of Eretz Yisrael<span class="x" onmousemove="('comment',' Which is subject to the law of not being sown with mingled seed. ');"><sup>30</sup></span> and the barley on the soil outside Eretz Yisrael,<span class="x" onmousemove="('comment',' Which is not subject to this law. ');"><sup>31</sup></span> would he be liable [as having transgressed the law]?<span class="x" onmousemove="('comment',' And since he would not be liable, what doubt could be entertained in the case of a goat and mullet? ');"><sup>32</sup></span> — I might answer: Where is the comparison? There [in your case]<span class="x" onmousemove="('comment',' Of sowing a field with mingled seed. ');"><sup>33</sup></span> Eretz Yisrael is the place subject to this obligation whereas any country outside Eretz Yisrael is not subject to this obligation; but here,<span class="x" onmousemove="('comment',' In the case of a goat and a mullet. ');"><sup>34</sup></span> both one place<span class="x" onmousemove="('comment',' The dry land. ');"><sup>35</sup></span> and the other<span class="x" onmousemove="('comment',' The sea. ');"><sup>36</sup></span> are subject to the obligation.<span class="x" onmousemove="('comment',' As derived above from the similarity of expressions 'after its kind'.] ');"><sup>37</sup></span>