סימן עג סעיף ד
אָסוּר לִקְבֹּעַ לְהָאֵינוֹ יְהוּדִי שֶׁיַּעֲשֶׂה הַמְּלָאכָה בְּשַׁבָּת. וַאֲפִלּוּ אִם אֵינוֹ קוֹבֵעַ לוֹ בְּפֵרוּשׁ שֶׁיַּעֲשֶׂה בְּשַׁבָּת, אֶלָּא שֶׁהוּא קוֹבֵעַ לוֹ זְמַן שֶׁיִּגָּמֵר הַמְּלָאכָה סָמוּךְ לְאַחַר הַשַׁבָּת, וְיָדוּעַ כִּי אִי אֶפְשָׁר שֶׁיִּגְמֹר אֶת הַמְּלָאכָה עַד יוֹם זֶה, אִם לֹא יַעֲשֶׂה גַּם בְּשַׁבָּת, גַּם כֵּן אָסוּר. וְכֵן אִם שׁוֹלֵחַ בְּיָדוֹ אִגֶּרֶת וְאוֹמֵר לוֹ, רְאֵה שֶׁתְּבִיאֵהוּ שָׁמָּה בְּיוֹם פְּלוֹנִי, וְיָדוּעַ כִּי אִי אֶפְשָׁר לְהַגִּיעַ שָׁמָּה אֶלָּא אִם כֵּן יֵלֵךְ גַּם בְּשַׁבָּת, גַּם כֵּן אָסוּר. וְכֵן אִם יוֹם הַשּׁוּק הוּא בְּיוֹם הַשַׁבָּת, אָסוּר לָתֵת לַנָּכְרִי מָעוֹת בְּעֶרֶב שַׁבָּת שֶּׁיִּקְנֶה לוֹ אֵיזֶה דָּבָר שֶׁיָּדוּעַ שֶׁאֵינוֹ מוֹצֵא לִקְנוֹתוֹ כִּי אִם בְּשַׁבָּת. וְכֵן אָסוּר לִתֵּן לוֹ אֵיזֶה דָּבָר לְמָכְרוֹ בְּעִנְיָן זֶה. וְאוּלָם אֹפֶן זֶה שֶׁאֵינוֹ קוֹבֵעַ לוֹ בְּפֵרוּשׁ שֶׁיַּעֲשֶׂה בַשַׁבָּת, אֵינוֹ אָסוּר, אֶלָּא בַּנּוֹתֵן לוֹ בְּעֶרֶב שַׁבָּת, אֲבָל קוֹדֵם לָכֵן, מֻתָּר לָתֵת לוֹ הַחֵפֶץ לַעֲשׂוֹת אוֹ מָעוֹת לִקְנוֹת, וְטוֹב שֶׁלֹּא לָדוּר כְּלָל בְּעִיר שֶׁיּוֹם הַשּׁוּק הוּא בְּשַׁבָּת, כִּי אִי אֶפְשָׁר שֶׁלֹּא יֶחְטָא. וְאִם הַשּׁוּק אֵינוֹ בִּשְׁכוּנַת הַיְהוּדִים, אֵין לָחשׁ.
d) It is forbidden to stipulate with the non-Jew that he do the work on Shabbos. Even if you are not explicit about his doing it on Shabbos, but you set the time for the work to be completed shortly after Shabbos, and it is clearly impossible to complete the work by that time unless it is done on Shabbos; this too is prohibited. Similarly, if you give him a letter and tell him, "See to it that it is delivered there on such and such day," and it is clearly impossible, unless he travels on Shabbos; this too is prohibited. Likewise, if the market day is on Shabbos, it is forbidden to give a non-Jew money9Peri Megadim 307 maintains that this is prohibited even if you do not give the non-Jew the money. on Friday to buy something for you when you know that he can only buy it on Shabbos. Similarly,10Magein Avraham 307. This sentence does not appear in many editions of the Kitzur Shulchan Aruch. it is forbidden to give him something to sell for you under these conditions. However, the aforementioned instance in which you did not specify that he do the work on Shabbos is only prohibited if you give (the work) to him on Erev Shabbos, but before then11According to the Kitzur Shulchan Aruch, you are permitted to give work to a non-Jew on Wednesday or Thursday even if you do not define his wages and even if it is impossible to accomplish it without working on Shabbos, provided you do not tell him to work on Shabbos. This is the ruling of the Magein Avraham 247: 4 and 307: 3. See Mishnah Berurah 247: 13. But the Mishnah Berurah 307: 12 seems to agree with Eliyahu Rabbah’s ruling that if it is not possible to accomplish the job without working on Shabbos, then it is the same as telling him to work on Shabbos, and it is not allowed, even in the beginning of the week. you may give him something to make or some money with which to make purchases. It is best not to live in a city where the (only) market day is on Shabbos, for it is impossible to avoid violations. If the market is not in the Jewish neighborhood, there is no reason to worry.
תנא דבי אליהו כל השונה הלכות בכל יום מובטח לו שהוא בן העולם הבא שנאמר הליכות עולם לו אל תקרי הליכות אלא הלכות (נדה ע"ג.)