וּמַה הִיא הַתְּשׁוּבָה. הוּא שֶׁיַּעֲזֹב הַחוֹטֵא חֶטְאוֹ וִיסִירוֹ מִמַּחֲשַׁבְתּוֹ וְיִגְמֹר בְּלִבּוֹ שֶׁלֹּא יַעֲשֵׂהוּ עוֹד שֶׁנֶּאֱמַר (ישעיה נה ז) "יַעֲזֹב רָשָׁע דַּרְכּוֹ" וְגוֹ'. וְכֵן יִתְנַחֵם עַל שֶׁעָבַר שֶׁנֶּאֱמַר (ירמיה לא יח) "כִּי אַחֲרֵי שׁוּבִי נִחַמְתִּי". וְיָעִיד עָלָיו יוֹדֵעַ תַּעֲלוּמוֹת שֶׁלֹּא יָשׁוּב לְזֶה הַחֵטְא לְעוֹלָם שֶׁנֶּאֱמַר (הושע יד ד) "וְלֹא נֹאמַר עוֹד אֱלֹהֵינוּ לְמַעֲשֵׂה יָדֵינוּ" וְגוֹ':
What constitutes Teshuvah? That a sinner should abandon his sins and remove them from his thoughts, resolving in his heart, never to commit them again as [Isaiah 55:7] states "May the wicked abandon his ways...." Similarly, he must regret the past as [Jeremiah 31:18] states: "After I returned, I regretted."
[He must reach the level where] He who knows the hidden will testify concerning him that he will never return to this sin again as [Hoshea 14:4] states: "We will no longer say to the work of our hands: `You are our gods.'" [Hil. Tshuva 2-2]
How does the pasuk "וְלֹא נֹאמַר עוֹד אֱלֹהֵינוּ לְמַעֲשֵׂה יָדֵינוּ" prove that one must take Hashem as a witness that he will never return to this sin?
[Note: The Kesef Mishna suggests an answer but לענ"ד it doesn't answer the question so I either need a pshat in the K"M or another answer].
Asking for the seminary roommate of the niece of a friend.
