Reference for Pesachim 93:8
שלח ליה רב חסדא לרבה ביד רב אחא בר רב הונא מי אמרינן הואיל והא תנן יש חורש תלם אחד וחייבין עליה משום שמונה לאוין החורש בשור וחמור והן מוקדשים וכלאים בכרם
Then according to R'Simeon B'Gamaliel who said on the authority of R'Simeon the son of the Segan: It overrides the Festival, what is there to be said? - He holds as Abba Saul, who interpreted: 'for you', but not for Gentiles.<span class="x" onmousemove="('comment',' Lit., 'strangers', v. Bez 20b.');"><sup>17</sup></span> R'Hisda sent to Rabbah by the hand of R'Aha son of R'Huna: But do we say 'since'? Surely we learned: One may plough one furrow, and be culpable for it on account of eight negative injunctions. [Thus:] he who ploughs with an ox and an ass [together], which are sacred, [and the furrow consists of] kil'ayim in a vineyard,