30מִי שֶׁנִּמְנָע מִלְּהַלְווֹת אֶת חֲבֵרוֹ קֹדֶם הַשְּׁמִטָּה שֶׁמָּא יִתְאַחֵר הַחוֹב שֶׁלּוֹ וְיִשָּׁמֵט עָבַר בְּלֹא תַּעֲשֶׂה שֶׁנֶּאֱמַר הִשָּׁמֶר לְךָ וְגוֹ'. וְחֵטְא גָּדוֹל הוּא שֶׁהֲרֵי הִזְהִירָה עָלָיו תּוֹרָה בִּשְׁנֵי לָאוִין שֶׁנֶּאֱמַר (דברים טו ט) "הִשָּׁמֶר לְךָ פֶּן" וְגוֹ'. וְכָל מָקוֹם שֶׁנֶּאֱמַר הִשָּׁמֶר אוֹ פֶּן אוֹ אַל הֲרֵי זֶה מִצְוַת לֹא תַּעֲשֶׂה. וְהַתּוֹרָה הִקְפִּידָה עַל מַחֲשָׁבָה רָעָה זוֹ וּקְרָאַתּוּ (דברים טו ט) "בְּלִיַּעַל". וַהֲרֵי הוֹסִיף הַכָּתוּב לְהַזְהִיר וּלְצַוּוֹת שֶׁלֹּא יִמָּנַע אֶלָּא יִתֵּן שֶׁנֶּאֱמַר (דברים טו י) "נָתוֹן תִּתֵּן לוֹ וְלֹא יֵרַע לְבָבְךָ בְּתִתְּךָ לוֹ" וְגוֹ'. וְהִבְטִיחַ הַקָּדוֹשׁ בָּרוּךְ הוּא בִּשְׂכַר מִצְוָה זוֹ בָּעוֹלָם הַזֶּה שֶׁנֶּאֱמַר (דברים טו י) "כִּי בִּגְלַל הַדָּבָר הַזֶּה יְבָרֶכְךָ" וְגוֹ':
One who refrains from lending money to a colleague before the Sabbatical year lest [the repayment] of the debt be delayed and it be nullified, violates a negative commandment, as [Deuteronomy 15:9] states: "Be careful [lest there be a wicked thought in your heart....]" It is a severe sin, for the Torah warned against it with two adjurations, for it is written: "Be careful lest," and whenever the Torah uses the expressions "Be careful," "lest," or "Do not," it is communicating a negative commandment. The Torah objected to this evil thought and called it "wicked" and the verse continued warning and commanding one not to refrain [from lending], but to give [the loan], as [ibid.:10] states: "You shall certainly give him and your Heart should not regret giving him." [Indeed,] the Holy One, blessed be He, promised that the reward for this mitzvah will be granted in this world, as [the verse continues:] "Because of this G-d will bless you."