סימן עב סעיף ד

כְּתִיב זָכֹר אֶת יוֹם הַשַׁבָּת לְקַדְּשׁוֹ. פֵּרוּשׁ שֶׁיִּזְכּוֹר בְּכָל יוֹם וָיוֹם אֶת יוֹם הַשַׁבָּת לְקַדְּשׁוֹ, שֶׁאִם נִזְדַּמֵּן לוֹ דְּבַר מַאֲכָל חָשׁוּב שֶׁאֵינוֹ שָׁכִיחַ בְּכָל יוֹם וְהוּא דָּבָר שֶׁאֵינוֹ מִתְקַלְקֵל, יִקְנֵהוּ לִכְבוֹד שַׁבָּת. וּבְעֶרֶב שַׁבָּת, מִצְוָה שֶׁיַּשְׁכִּים בַּבֹּקֶר לִקְנֹת צָרְכֵי שַׁבָּת. וְיכוֹל לִקְנוֹת גַּם קֹדֶם הַתְּפִלָּה ובִלְבַד שֶׁלֹּא יְאַחֵר עַל יְדֵי זֶה תְּפִלַּת צִבּוּר. וְטוֹב יוֹתֵר לִקְנֹת בְּעֶרֶב שַׁבָּת לִכְבוֹד שַׁבָּת, מִלִּקְנֹת בְּיוֹם ה'. אַךְ דָּבָר שֶׁצָּרִיךְ הֲכָנָה, יִקְנֶה בְּיוֹם ה'. וְעַל כָּל דָּבָר שֶׁהוּא קוֹנֶה, יֹאמַר לִכְבוֹד שַׁבָּת. מִתַּקָּנַת עֶזְרָא, שֶׁיִּהְיוּ מְכַבְּסִין הַבְּגָדִים בַּחֲמִשִּׁי בְּשַׁבָּת לִכְבוֹד שַׁבָּת. וְלֹא בְּעֶרֶב שַׁבָּת, מִפְּנֵי שֶׁבְּעֶרֶב שַׁבָּת צָרִיךְ לְהִתְעַסֵּק בְּצָרְכֵי שַׁבָּת.

It is written, "Remember the Shabbos day to keep it holy,"²¹Exodus 20: 8. which means: you must remember the Shabbos every day of the week to keep it holy. Thus, if you happen to find a rare delicacy which is not available every day,²²If it is something that is available you need not set it aside for Shabbos, but you may use it and hope that you will find one of better quality (later in the week) for Shabbos. See Maseches Beitzah 16a. and which will not spoil, you should buy it in honor of Shabbos. On the eve of Shabbos²³Friday. it is a mitzvah to rise early in the morning to purchase your Shabbos needs. You may shop for them even before saying the [morning] prayers,²⁴Rashi and Tur. However the Mishnah Berurah rules that you may purchase your Shabbos needs before the morning prayers only if the better produce will be sold out by the time you pray. Kerias Shema, however, should be recited before going to the market. provided that doing so will not cause you to miss praying with the congregation.²⁵Mishnah Berurah (Biur Halachah 250: 1) rules that when there is a possibility that the good produce may be sold out, you must purchase the necessities of Shabbos even if you miss praying with the congregation (minyan). It is preferable to make purchases on Friday in honor of Shabbos²⁶For the Shabbos portion of manna came down early Friday morning [Magein Avraham]. rather than on Thursday. But something that requires preparation should be purchased on Thursday. With each purchase you make you should say, "This is in honor of Shabbos."²⁷Ari z” l. In accordance with the ordinance of Ezra,²⁸See Maseches Bava Kama 82a. Ten ordinances of Ezra. clothes should be laundered on Thursday in honor of Shabbos,²⁹The Takanah of Ezra was to wash clothing that will be worn on Shabbos. [Mishnah Berurah 242]. and not on Friday, because on Friday you must be engaged in preparations³⁰Rosh. for Shabbos.

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.)