וְזֶה֮ דְּבַ֣ר הַשְּׁמִטָּה֒ שָׁמ֗וֹט כָּל־בַּ֙עַל֙ מַשֵּׁ֣ה יָד֔וֹ אֲשֶׁ֥ר יַשֶּׁ֖ה בְּרֵעֵ֑הוּ לֹֽא־יִגֹּ֤שׂ אֶת־רֵעֵ֙הוּ֙ וְאֶת־אָחִ֔יו כִּֽי־קָרָ֥א שְׁמִטָּ֖ה לַֽיהוָֽה׃
A oto sposób odpuszczenia: odpuszczać ma każdy wierzyciel wierzytelność swoję, którą wypożyczył bliźniemu swemu; nie będzie nalegał na bliźniego i na brata swego, gdy ogłoszono odpuszczenie gwoli Wiekuistemu.
Rashi
שמוט כל בעל משה ידו means as much as שמוט את ידו של כל בעל משה THERE SHALL BE A RELAXING OF THE HAND OF EVERY CREDITOR.
Chizkuni
וזה דבר השמיטה, “and this is the manner of the sh’mittah, release;” this year even releases a person from fulfilling an undertaking confirmed by an oath. If a person had undertaken to do something for his fellow and confirmed it by an oath, the advent of the end of the last day of the sh’mittah year releases him from it if he had not made good on his promise until then. (B’chor shor)
Da'at Zekenim
וזה דבר השמטה, “this shall be the nature of the remission;” our sages in tractate Gittin, folio 37 state that this wording is the source of the rule that if a borrower comes to the lender in the sh’mittah year offering to pay back what he had borrowed, the lender has to decline by saying: “I remit the debt.” A similar rule applies to when a person guilty of having killed someone unintentionally comes to the gates of a city of refuge asking for entry he has to say: I have killed someone.” This too is derived from the wording: וזה דבר הרוצח, “this is the nature of the law concerning an unintentional killer;” (Compare Deuteronomy 19,4). The Jerusalem Talmud in tractate Makkot, chapter 2, halachah 6, adds that if someone had shown that he has complete mastery of one tract of the Talmud, and he is praised as if he had mastered two tractates, he is obliged to respond that he has mastered only a single tractate.