יג אמרת ק"ו ומה אמו שנכנסה עמו לדיר להתעשר נאסרה עמו בבשול אחותו שלא נכנסה עמו לדיר להתעשר אינו דין שנאסרה עמו בבשול תלמוד לומר בחלב אמו
13 From this I know [that the kid is forbidd in its mother's milk, but where do I know [that it is forbidden] in the milk of its 'older sister'!<span class="x" onmousemove="('comment',' I.e., cows, in contradistinction from 'the younger sister' i.e., sheep. This is the explanation which Rashi says he received from his teachers, but after criticizing it Rashi expresses his preference for the interpretation of R. Joseph Bonfils, according to which 'older sister' and 'younger sister' are both goats, the former, however, being a goat of last year's breeding which had already been counted with other goats for the purposes of tithing, the latter being one which has not been counted with others for tithing.');"><sup>14</sup></span> From the following a fortiori argument: If [in the milk of] its mother, which enters the cattle-pen together [with the ki to be tithed,<span class="x" onmousemove="('comment',' Cf. Lev. XXVII, 32, and Bek. IX. It has been laid down (a) that cattle may not be counted together with sheep or goats for the purposes of tithing nor vice versa. Moreover (b) an animal which has once been counted with others for the purposes of tithing cannot be counted again. The 'older sister' therefore cannot be counted together with kids for tithing either because of (a) or (b) , according to whichever interpretation is adopted. V. preceding note.');"><sup>15</sup></span> it is forbidden to cook [the kid], how much more [in the milk of] its 'older sister', which does not enter the cattlepen together [with the kid] to be tithed,<span class="x" onmousemove="('comment',' Cf. Lev. XXVII, 32, and Bek. IX. It has been laid down (a) that cattle may not be counted together with sheep or goats for the purposes of tithing nor vice versa. Moreover (b) an animal which has once been counted with others for the purposes of tithing cannot be counted again. The 'older sister' therefore cannot be counted together with kids for tithing either because of (a) or (b) , according to whichever interpretation is adopted. V. preceding note.');"><sup>15</sup></span> is it forbidden to cook the kid! And the text also teaches, 'In its mother's milk'.