הַנִּכְנָס לִכְרַךְ מִתְפַּלֵּל שְׁתַּיִם, אַחַת בִּכְנִיסָתוֹ וְאַחַת בִּיצִיאָתוֹ. בֶּן עַזַּאי אוֹמֵר, אַרְבַּע, שְׁתַּיִם בִּכְנִיסָתוֹ וּשְׁתַּיִם בִּיצִיאָתוֹ, וְנוֹתֵן הוֹדָאָה לְשֶׁעָבַר, וְצוֹעֵק לֶעָתִיד לָבֹא:
Wer in eine Festung eintritt, bete zweimal, ein Gebet beim Eintreten und eins beim Herausgehen. Ben Asai sagt: Vier, zwei beim Eintreten und zwei beim Herausgehen. Man danke nämlich für das Vergangene und bete für das Bevorstehende.
Mishnah Avodah Zarah
If [a Jew] left his wine in a wagon or on a ship while he went along a short cut, entered a town and bathed, it is permitted. But if [the Jew] informed him that he was going away [and he was absent a length of time] sufficient for the other to bore a hole [in a jar], stop it up and [the sealing clay] to become dry, [the wine is prohibited]. Rabban Shimon ben Gamaliel says: [a length of time] sufficient for him to open a cask, put a new stopper on and [the new stopper] to become dry. If [a Jew] left a non-Jew in his shop, although he kept going in and out, [the wine there] is permitted. But if [the Jew] informed him that he was going away [and he was absent a length of time] sufficient for the other to bore a hole [in a jar], stop it up and [the sealing clay] to become dry, [the wine is prohibited]. Rabban Shimon ben Gamaliel says: [a length of time] sufficient for him to open a cask, put a new stopper on and [the new stopper] to become dry.