Reference for Zevachim 231:17
ומר נמי הכתיב עורי צפון [ההוא] בקיבוץ גליות הוא דכתיב
[this means,] Awake, O people whose rites [were performed] in the north, and come, O people, whose rites [will henceforth be performed] in the north and the south.<span class="x" onmousemove="('comment',' The burnt-offering was slaughtered on the north side of the altar; the peace-offering, on any side. He renders: Awake, O nation who hitherto, as Children of Noah, could only sacrifice on the north side of the altar (hence, burnt-offerings) and now, by accepting the Torah, come as a people who can sacrifice in the north and the south. - Cf. Gen. Rab. XXII, 5 (Sonc. ed. p. 183.)');"><sup>20</sup></span> But as to this master, surely it is written, 'of the f thereof'? - That means, of their fat ones.<span class="x" onmousemove="('comment',' Sc. the best.');"><sup>21</sup></span>