Reference for Chullin 270:30
לכדרבה דאמר רבה
As regards the law of the firstling, although it is written: All the firstling males that are born of thy he and of thy flock,<span class="x" onmousemove="('comment',' Deut. XV, 19.');"><sup>17</sup></span> [from which it would follow that] thine only is subject but not what is held jointly, the Divine Law stated: And the firstlings of your herd and of your flock.<span class="x" onmousemove="('comment',' Ibid. XII, 6.');"><sup>18</sup></span> What then is the significance of 'thy herd and thy flock'? - It excludes what is held jointly with a gentile. As regards the law of mezuzah,<span class="x" onmousemove="('comment',' V. Glos.');"><sup>19</sup></span> although it is written: Thy house,<span class="x" onmousemove="('comment',' Ibid. VI, 9.');"><sup>20</sup></span> [from which it would follow that] thine only is subject but not what is held jointly, the Divine Law stated: That your days may be multiplied and the days of your children.<span class="x" onmousemove="('comment',' Deut. XI, 21.');"><sup>21</sup></span> What then is the significance of 'thy house'? - It is as Rabbah stated. For Rabbah stated: