Pocket Beit Midrash Ki Teitzei 4th Aliyah

(יג) וְיָד֙ תִּהְיֶ֣ה לְךָ֔ מִח֖וּץ לַֽמַּחֲנֶ֑ה וְיָצָ֥אתָ שָׁ֖מָּה חֽוּץ׃ (יד) וְיָתֵ֛ד תִּהְיֶ֥ה לְךָ֖ עַל־אֲזֵנֶ֑ךָ וְהָיָה֙ בְּשִׁבְתְּךָ֣ ח֔וּץ וְחָפַרְתָּ֣ה בָ֔הּ וְשַׁבְתָּ֖ וְכִסִּ֥יתָ אֶת־צֵאָתֶֽךָ׃ (טו) כִּי֩ ה' אֱלֹקֶ֜יךָ מִתְהַלֵּ֣ךְ ׀ בְּקֶ֣רֶב מַחֲנֶ֗ךָ לְהַצִּֽילְךָ֙ וְלָתֵ֤ת אֹיְבֶ֙יךָ֙ לְפָנֶ֔יךָ וְהָיָ֥ה מַחֲנֶ֖יךָ קָד֑וֹשׁ וְלֹֽא־יִרְאֶ֤ה בְךָ֙ עֶרְוַ֣ת דָּבָ֔ר וְשָׁ֖ב מֵאַחֲרֶֽיךָ׃

Deuteronomy 23:13-16

(13) Further, there shall be an area for you outside the camp, where you may relieve yourself. (14) With your gear you shall have a spike, and when you have squatted you shall dig a hole with it and cover up your excrement. (15) Since the LORD your God moves about in your camp to protect you and to deliver your enemies to you, let your camp be holy; let Him not find anything unseemly among you and turn away from you.

ספורנו על דברים כ״ג:ט״ו:ג׳

מאחריך כאשר תפנה אליו עורף ולא תחוש לכבודו באחד מאלה:

Sforno on Deuteronomy 23:15:3

מאחריך, if you were to turn your rear to Him by ignoring these laws and thus insulting Him.

אבן עזרא על דברים כ״ג:ט״ו:ב׳

ושב מאחריך. הטעם שלא ילך לפניך כי כן כתוב:

Ibn Ezra on Deuteronomy 23:15:2

lest He depart from you meaning that he will not “walk before you”, as stated.

סוטה ג׳ ב:י״ב

ואמר רב חסדא בתחילה קודם שחטאו ישראל היתה שכינה שורה עם כל אחד ואחד שנאמר (דברים כג, טו) כי ה' אלהיך מתהלך בקרב מחניך כיון שחטאו נסתלקה שכינה מהם שנאמר (דברים כג, טו) ולא יראה בך ערות דבר ושב מאחריך

Sotah 3b:12

And Rav Ḥisda says: Initially, before the Jewish people sinned, the Divine Presence resided with each and every one of them, as it is stated: “For the Lord your God walks in the midst of your camp” (Deuteronomy 23:15). Once they sinned, the Divine Presence withdrew from them, as it is stated in that same verse: “That He see no unseemly matter in you, and turn away from you” (Deuteronomy 23:15), teaching that when there is an “unseemly matter” among the Jewish people, the Divine Presence no longer resides among them.

שבת ק״נ א:ז׳

רָמֵי לֵיהּ רַב אַחָא בַּר רַב הוּנָא לְרָבָא: מִי אָמַר רַבִּי יוֹחָנָן דִּיבּוּר אָסוּר הִרְהוּר מוּתָּר — אַלְמָא הִרְהוּר לָאו כְּדִיבּוּר דָּמֵי? וְהָאָמַר רַבָּה בַּר בַּר חָנָה אָמַר רַבִּי יוֹחָנָן: בְּכׇל מָקוֹם מוּתָּר לְהַרְהֵר, חוּץ מִבֵּית הַמֶּרְחָץ וּמִבֵּית הַכִּסֵּא! שָׁאנֵי הָתָם, דְּבָעֵינַן ״וְהָיָה מַחֲנֶיךָ קָדוֹשׁ״, וְלֵיכָּא.

Shabbat 150a:7

Rav Aḥa bar Rav Huna raised a contradiction to Rava: Did Rabbi Yoḥanan really state as a general principle that speaking is prohibited, but contemplating is permitted? Consequently, we can derive from here that contemplation is not tantamount to speech. But Rabba bar bar Ḥana said that Rabbi Yoḥanan said: It is permitted to think about Torah in any place except for a bathhouse and a bathroom. This statement indicates that contemplation is tantamount to speech, as even thought is prohibited in these locations. The Gemara answers: It is different there, for with regard to Torah we need to fulfill the verse: “For the Lord your God walks in the midst of your camp to deliver you and to give your enemies before you; therefore, your camp shall be sacred so that He see no unseemly thing in you and turn away from you” (Deuteronomy 23:15); and the requirement to be sacred is not fulfilled if one thinks about Torah while in the bathhouse or bathroom.