Reference for Avodah Zarah 121:12

HALAKHAH: “One who makes a Non-Jew’s wine in purity,” etc. ¹⁹⁰This Halakhah discusses Mishnah 12.Rebbi Abbahu in the name of Rebbi Yose ben Rebbi Ḥanina: Not only a door but even a window wide four by four and high ten¹⁹¹Since the numerals are masculine they denote hand-breadths, not quite 10cm. An opening of 4-by-4 and high 10 is considered a door also for the rules of impurity., on condition that it be roofed and glued closed¹⁹²Not the door but the amphora in which the wine is stored. It cannot be left open in the Gentile’s place under any circumstances but must have a cover, “be roofed”, and the cover must be glued to the amphora by clay which is left to dry. Then it is sufficient that an occasional visitor check that the clay seal is inviolate.. If it was growing, we would say if he is seen climbing up and coming down it is forbidden, otherwise it is permitted¹⁹³If the wine is stored on a tree (a seemingly unlikely case but which is mentioned also in the Babli, 61a). If an amphora is stored at a place reserved for it and the Gentile is seen going there where he has no reason to be, the wine will become forbidden since one must suspect him of removing the seal, taking some wine, and resealing.. Rebbi Abba in the name of Rav Jehudah: The Mishnah speaks of a town “with double doors and bolts.¹⁹⁴A fortified city; the expression is Biblical (Deut. 3:5). In the Babli the author is Samuel, Rav Jehudah’s teacher and the statement is accepted as authoritative. According to Rashi, the reason is that there all inhabitants are known and easily checked out; therefore one does not need a permanent presence of the watchman.” Was it stated in that case “a watchman even if he comes only at intervals”?