Deuteronomy 23:22

לֹא־תַשִּׁיךְ לְאָחִיךָ נֶשֶׁךְ כֶּסֶף נֶשֶׁךְ אֹכֶל נֶשֶׁךְ כָּל־דָּבָר אֲשֶׁר יִשָּֽׁךְ

Thou shalt not lend upon interest to thy brother: interest of money, interest of victuals, interest of any thing that is lent upon interest.

לַנָּכְרִי תַשִּׁיךְ וּלְאָחִיךָ לֹא תַשִּׁיךְ לְמַעַן יְבָרֶכְךָ יְהוָה אֱלֹהֶיךָ בְּכֹל מִשְׁלַח יָדֶךָ עַל־הָאָרֶץ אֲשֶׁר־אַתָּה בָא־שָׁמָּה לְרִשְׁתָּֽהּ

Unto a foreigner thou mayest lend upon interest; but unto thy brother thou shalt not lend upon interest; that the LORD thy God may bless thee in all that thou puttest thy hand unto, in the land whither thou goest in to possess it.

וְכִי תֶחְדַּל לִנְדֹּר לֹֽא־יִהְיֶה בְךָ חֵֽטְא

But if thou shalt forbear to vow, it shall be no sin in thee.

מוֹצָא שְׂפָתֶיךָ תִּשְׁמֹר וְעָשִׂיתָ כַּאֲשֶׁר נָדַרְתָּ לַיהוָה אֱלֹהֶיךָ נְדָבָה אֲשֶׁר דִּבַּרְתָּ בְּפִֽיךָ

That which is gone out of thy lips thou shalt observe and do; according as thou hast vowed freely unto the LORD thy God, even that which thou hast promised with thy mouth.